By Alexei Anishchuk

BISHKEK, Sept 13 (Reuters) - Russian President Vladimir Putin on Friday welcomed Syria's announcement that it had joined a global anti-chemical weapons treaty, saying it showed Damascus was serious in its intention to resolve conflict in the country.

Syria became a full member of the global anti-chemical weapons treaty on Thursday, the country's U.N. envoy said, a move that the government of Syrian President Bashar al-Assad had promised as part of a Russian plan to avoid U.S. strikes.

"I believe we should welcome such a decision," Putin told a Shanghai Cooperation Organisation summit.

"(It) is an important step towards the resolution of the Syrian crisis, this confirms the serious intention of our Syrian partners to follow this path."

Syria agreed to the plan brokered by Russia, its most powerful ally, to transfer its chemical arms to international custody after Washington threatened military strikes over a gas attack on Aug. 21 that it attributes to government forces.

China's President Xi Jinping threw his weight behind the Russian initiative and the Chinese Foreign Ministry said in an a statement released almost simultaneously that it welcomed Damascus's move to join the anti-chemical arms convention.

Both Russia and China have blocked successive U.N. Security Council resolutions aimed at pressuring Assad to end violence that has killed more than 100,000 in the more than two-and-a-half year-long conflict.

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  • In this Wednesday, Sept. 11, 2013 photo, a Syrian woman smokes a cigarette outside her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. President Michel Suleiman has said at least one million Syrian refugees are in Lebanon, with thousands more crossing over each week. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian woman adjusts her scarf inside her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. President Michel Suleiman has said at least one million Syrian refugees are in Lebanon, with thousands more crossing over each week. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, Syrian siblings pose for a portrait near their tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. Prolonged exposure to violence, losing their homes, and the loss of loved ones are leaving the children of Syria with lasting emotional scars, UNICEF said Tuesday. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, an elderly Syrian woman poses for a portrait inside her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. President Michel Suleiman has said at least one million Syrian refugees are in Lebanon, with thousands more crossing over each week. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian girl poses for a portrait inside her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. President Michel Suleiman has said at least one million Syrian refugees are in Lebanon, with thousands more crossing over each week. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian refugee boy stands inside the kitchen of a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. Many of the refugees stay in collective shelters, underground parking lots and abandoned construction sites, on sidewalks, under bridges and in tin shacks strung with laundry lines. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian girl eats a tomato at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. UNICEF estimates that more than 4 million Syrian children are affected by the ongoing conflict. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, an elderly Syrian woman poses for a portrait near her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. For those who cannot afford rent prices, living conditions can be appalling. Unlike in Jordan and Turkey, the Lebanese government has ruled out erecting refugee camps for political reasons. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian girl poses for a portrait inside her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. Lebanon, a tiny country of about 4.5 million, now hosts over 700,000 refugees. Many more are unregistered and uncounted. President Michel Suleiman has said at least one million Syrian refugees are in Lebanon, with thousands more crossing over each week. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian girl poses for a portrait near her tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. About 200 refugees live together in tents pitched near the Syrian border. They offer no protection from Lebanon's sizzling summers and its freezing winters, and there is barely any running water and no electricity. (AP Photo/Nariman El-Mofty)

  • In this Wednesday, Sept. 11, 2013 photo, a Syrian refugee woman smokes a cigarette outside of her tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour in the Bekaa valley, near the border with Syria. She is just one of Syria's refugees in Lebanon, driven out of their homes by a civil war that has killed more than 100,000 and displaced millions. (AP Photo/Nariman El-Mofty)

  • Syrian refugee boys wash their hands inside a kitchen a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley near the border with Syria, Wednesday, Sept. 11, 2013. Lebanon, which shares a border with Syria, is already host to nearly 1 million Syrian refugees. (AP Photo/Nariman El-Mofty, File)

  • A Syrian refugee sits on the ground at a temporary refugee camp in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, on Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Mohammed Bakir

    Syrian refugee Mohammed Bakir, who suffers from a disability due to heavy shelling, according to his family, sits on a wheelchair inside his tent at a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley near the border with Syria, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Nariman El-Mofty)

  • A Syrian refugee girl drinks water from a hose near a temporary refugee camp in the eastern Lebanese town of al-Faour in the Bekaa valley near the border with Syria, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Nariman El-Mofty)

  • Syrian refugee children run near their tents a temporary refugee camp in the eastern Lebanese own of al-Faour in the Bekaa valley near the border with Syria, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Nariman El-Mofty)

  • Syrian refugee men rest inside a tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Mohammed Ahmed, 20, right, who fled his home with his family from Baba Amro, Homs province, carries his son at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa Valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • A Syrian refugee boy stands outside his tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa Valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Youssef, walks near his tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Youssef's father, a Free Syrian Army fighter was killed during the civil war. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • A Syrian refugee girl flashes the victory sign inside her tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • A Syrian refugee family rest outside their tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Mohammed Ahmed, 20, rests inside his tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • A Syrian refugee girl washes rice outside her tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Essam, left, trims a mans hair, as children pose for a photograph at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa Valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Essam opened his own barber shop at the refugee camp and charges 2 dollars per cut to make a living, after aid has decreased drastically in the past couple of months. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Khalid El-Abd, 60, who suffers from cerebral palsy, poses for a photograph at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • A Syrian refugee girl stands outside her tent at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugees carry aid supplies distributed by the UNHCR, near a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)

  • Syrian refugee, Essam, left, trims a mans hair at a temporary refugee camp, in the eastern Lebanese town of al-Faour, Bekaa valley near the border with Syria, Lebanon, Wednesday, Sept. 11, 2013. Essam opened his own barber shop at the refugee camp and charges 2 dollars per cut to make a living, after aid has decreased drastically in the past couple of months. Lebanon is a tiny country that shares a porous border with Syria, and has seen cross-border shelling, sectarian clashes and car bombings in recent months related to the civil war raging next door. The country of 4.5 million already is already host to nearly 1 million Syrian refugees. (AP Photo/Hussein Malla)