JERUSALEM — Israel's prime minister on Tuesday voiced deep skepticism about the new Iranian president's outreach to the West, saying the world "should not be fooled" and must keep up the pressure on Tehran's suspect nuclear program.

Prime Minister Benjamin Netanyahu issued the warning shortly before the Iranian president, Hasan Rouhani, was to address the U.N. General Assembly. The televised statement was meant as a counterweight to the growing enthusiasm in the West over a series of moderate overtures by Rouhani.

Israeli officials believe Iran is trying to develop a nuclear bomb, and in recent days, officials have voiced fears that Rouhani's gestures to the West will lead to an easing of international pressure. In comments likely to play into those fears, President Barack Obama told the U.N. on Tuesday that he had instructed Secretary of State John Kerry to explore contacts with Iran.

"Israel would welcome a genuine diplomatic solution that truly dismantles Iran's capacity to develop nuclear weapons," Netanyahu said in a videotaped statement. "But we will not be fooled by half-measures that merely provide a smokescreen for Iran's continual pursuit of nuclear weapons. And the world should not be fooled either."

Netanyahu said he would discuss the matter with Obama at a White House meeting next week.

"I appreciate President Obama's statement that `Iran's conciliatory words will have to be matched by action that is transparent and verifiable,'" Netanyahu said. He claimed that Iran is merely trying to trick the world into easing painful economic sanctions so it can continue with efforts to build nuclear weapons.

"Iran thinks that soothing words and token actions will enable it to continue on its path to the bomb," Netanyahu said. "Like North Korea before it, Iran will try to remove sanctions by offering cosmetic concessions, while preserving its ability to rapidly build a nuclear weapon at a time of its choosing."

Iran denies accusations by Israel and Western countries that it is seeking nuclear weapons, saying its nuclear program is for peaceful purposes only.

Israel considers a nuclear-armed Iran to be a threat to its very existence, citing Iran's repeated calls for Israel's destruction, its sophisticated arsenal of weapons and its support for Israel's bitterest Arab enemies.

Netanyahu has issued four demands for halting Iran's nuclear program. He says Iran must stop enriching uranium, a key step in developing a nuclear weapon; ship its stockpile of enriched uranium out of the country; close a heavily fortified underground enrichment facility; and not make plutonium, another possible path to nuclear weapons. He also says any diplomatic activity must be accompanied by a "credible" military threat.

In the current diplomatic environment, it seems unlikely the West will insist on such conditions. Israel has repeatedly threatened to attack Iran, unilaterally if necessary, if it concludes diplomacy has failed.

Earlier, Netanyahu said he had instructed Israel's U.N. delegation to boycott Rouhani's speech and walk out of the General Assembly. Israel has strongly objected to efforts by its enemies to boycott it in international bodies, as well as attempts by pro-Palestinian activists to boycott Israeli businesses and products.

Netanyahu said that Rouhani had refused to recognize the Holocaust. He said that when Iranian leaders stop denying the Holocaust, halt their calls for Israel's destruction and recognize Israel's right to exist, then Israel will attend their speeches at the U.N.

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  • Iranians celebrate the victory of moderate presidential candidate Hassan Rouhani (portrait) in the presidential elections at Vanak square in northern Tehran on June 15, 2013. Iranian Interior Minister Mohammad Mostafa Najjar said Rouhani won outright with 18.6 million votes, or 50.68 percent. (ATTA KENARE/AFP/Getty Images)

  • Passengers in a public bus flash victory signs in a reaction of supporters of the Iranian presidential candidate Hassan Rouhani, as they attend a celebration gathering, in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • A supporter of Iranian presidential candidate Hassan Rouhani, shown in poster, attends a celebration gathering in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • Supporters of the Iranian presidential candidate Hassan Rouhani, shown in poster at center, attend a celebration gathering in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • A female supporter of Iranian presidential candidate Hassan Rouhani flashes a victory sign as she holds his poster during a celebration gathering in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • Supporter of the Iranian presidential candidate Hassan Rouhani celebrate outside his campaign headquarters in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • A female supporter of Iranian presidential candidate Hassan Rouhani, flashes a victory sign as she holds his poster during a celebration gathering in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • A supporter of Iranian presidential candidate Hassan Rouhani holds his poster as another youth waves to a clergyman outside the campaign headquarters of Rouhani, in Tehran, a day after the election, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • An Iranian woman flashes the sign for victory as she holds a portrait of moderate presidential candidate Hassan Rouhani during celebrations for his victory in the Islamic Republic's presidential elections in downtown Tehran on June 15, 2013. (BEHROUZ MEHRI/AFP/Getty Images)

  • Iranians supporters of moderate presidential candidate, Hassan Rouhani flash the sign of victory holding a portrait of him as they wait for the final results outside his campaign headquarter in downtown Tehran on June 15, 2013. Rouhani has a clear lead in Iran's presidential election, garnering 51 percent of the vote at 65 percent of polling stations across the country, the interior ministry said. (BEHROUZ MEHRI/AFP/Getty Images)

  • An Iranian woman holds a portrait of moderate presidential candidate Hassan Rouhani as she rides on a motorcycle along Valiasr street in Tehran on June 15, 2013 after he was elected as president. (BEHROUZ MEHRI/AFP/Getty Images)

  • An Iranian woman holds her purple scarf, the campaign color of moderate presidential candidate Hassan Rouhani, as she celebrates along Valiasr street after he was elected as president on June 15, 2013, in the capital Tehran. (BEHROUZ MEHRI/AFP/Getty Images)

  • Iranians gather as they celebrate the victory of moderate presidential candidate Hassan Rouhaniin the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. Iranian Interior Minister Mohammad Mostafa Najjar said Rouhani won outright with 18.6 million votes, or 50.68 percent. (ATTA KENARE/AFP/Getty Images)

  • Iranian supporters of moderate presidential candidate Hassan Rouhani who won the national elections, celebrate in downtown Tehran on June 15, 2013. (BEHROUZ MEHRI/AFP/Getty Images)

  • Iranians celebrate along Valiasr street, in the capital Tehran, on June 15, 2013, after moderate presidential candidate Hassan Rouhani was elected as president. (BEHROUZ MEHRI/AFP/Getty Images)

  • An Iranian woman celebrates the victory of moderate presidential candidate Hassan Rouhani (portrait) in the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranians celebrate the victory of moderate presidential candidate Hassan Rouhani (portrait) in the Islamic Republic's presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranians celebrate the victory of moderate presidential candidate Hassan Rouhani (portrait) in the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranians gather to celebrate the victory of moderate presidential candidate Hassan Rouhani in the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • An Iranian woman celebrates the victory of moderate presidential candidate Hassan Rouhani in the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranians gather as they celebrate the victory of moderate presidential candidate Hassan Rouhani in the presidential elections at Vanak Square, in northern Tehran, on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranian women hold a portrait of moderate presidential candidate Hassan Rouhani who won the national election in downtown Tehran on June 15, 2013. (BEHROUZ MEHRI/AFP/Getty Images)

  • A female supporter of Iranian presidential candidate Hasan Rouhani flashes a victory sign, as she holds his poster, during a celebration gathering, in Tehran, Iran, Saturday, June 15, 2013. (AP Photo/Vahid Salemi)

  • Iranians celebrate the victory of moderate presidential candidate Hassan Rowhani (portrait) in the Islamic Republic's presidential elections in downtown Tehran on June 15, 2013. (BEHROUZ MEHRI/AFP/Getty Images)

  • In front of a portrait of the late Iranian revolutionary founder Ayatollah Khomeini, presidential candidate Hasan Rowhani, a former top nuclear negotiator, center, gestures to his supporters at a rally in Tehran, Iran, Saturday, June 1, 2013. (AP Photo/Ebrahim Noroozi, File)

  • An Iranian woman holds a portrait of moderate presidential candidate Hassan Rouhani as she rides on a motorcycle along Valiasr street in Tehran on June 15, 2013 after he was elected as president. (BEHROUZ MEHRI/AFP/Getty Images)

  • Iranians celebrate the victory of moderate presidential candidate Hassan Rouhani in the Islamic Republic's presidential elections at Vanak square in northern Tehran on June 15, 2013. (ATTA KENARE/AFP/Getty Images)

  • Iranians celebrate the victory of moderate presidential candidate Hassan Rowhani (portrait) in the Islamic Republic's presidential elections at Vanak square in northern Tehran on June 15, 2013. (ATTA KENARE/AFP/Getty Images)