KIEV, Ukraine — Urging all nations to be extremely cautious with nuclear energy, Ukraine's president thanked donors for financing the construction of a new, safer shelter over the damaged Chernobyl reactor on the 26th anniversary of the world's worst nuclear disaster.
President Viktor Yanukovych spoke during a ceremony Thursday inaugurating the initial assembly of a gigantic arch-shaped steel containment building to cover the remnants of the exploded reactor. The structure – weighing 20,000 tons and big enough to house New York's Statue of Liberty – is due to be completed in 2015, allowing the delicate and dangerous job of dismantling the reactor and cleaning vast amounts of radioactive waste still around it to begin.
"The Chernobyl disaster underscored that mankind must be extra careful in using nuclear technologies," Yanukovych said. "Nuclear accidents lead to global consequences. They are not a problem of just one country, they affect the life of entire regions."
The April 26, 1986, explosion spewed a cloud of radiation over much of the northern hemisphere, forcing hundreds of thousands of people from their homes in heavily hit areas of Ukraine, Belarus and western Russia. The Soviet government initially tried to hush up the explosion and resisted immediately evacuating nearby residents. It also failed to tell the public what happened or instruct residents and cleanup workers on how to protect themselves against radiation, which significantly increased the health damage from the disaster.
A shelter called the "sarcophagus" was hastily erected over the damaged reactor, but it has been crumbling and leaking radiation in recent years and a new confinement structure is necessary.
Yanukovych said 2 million people have been hurt by the tragedy and it is the state's obligation to protect and treat them.
But his reassurances fell flat with some Chernobyl cleanup workers and victims. About 2,000 protesters staged an angry rally Thursday outside parliament in Kiev, demanding an increase in compensations and pensions.
In Minsk, the capital of Belarus, more than 1,000 demonstrators took part in a march protesting plans to build the former Soviet republic's first nuclear power station, in the town of Ostrovets near the Lithuanian border. The plant will be built by Russia.
"This project is approved by the Kremlin, which through the nuclear power plant is binding all of the energy of Belarus to itself," said Anatoly Lebedko, one of the protest leaders.
A similar march in 2011 was banned by the authoritarian government, which routinely represses opposition actions, but this year's march was sanctioned and police did not interfere.
Yanukovych also thanked international donors for pledging (EURO)740 million ($980 million) to build the new shelter and a nuclear fuel waste facility. The biggest donors are the Group of Eight industrial nations, including Japan, which itself is still recovering from last year's horrific Fukushima nuclear disaster.
"It feels good to note that Ukraine wasn't left alone with its pain. We felt that the whole world came to our rescue," Yanukovych said.
Vince Novak, director of the Nuclear Safety Department with the European Bank for Reconstruction and Development, which manages and co-funds the project, praised Ukraine's commitment to the cleanup.
"It is definitely important for the bank and for the donors to know that there is a strong commitment in Ukraine to do everything necessary to ensure that the Chernobyl project progresses well," Novak told The Associated Press. "We have no room or margins for delay, for errors or for poor performance."
Novak said 1,000 workers are now beginning to piece together the giant arch from special French-made steel on an assembly site 200 meters (yards) away from the exploded reactor. After it is assembled, it will be slid to cover the reactor building.
Preparatory work for the new building has been under way since 2008. That included cleaning up the assembly site, replacing contaminated soil, and then putting it in concrete, which now enables employees to work without special radiation protection.
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Associated Press writer Yuras Karmanau in Minsk contributed to this report.
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A disabled man cries at the Chernobyl victims memorial in Kiev during a memorial ceremony on April 26, 2012. Ukraine launched construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. President Viktor Yanukovych pressed a symbolic button at the construction site, watched by workers and ambassadors from China, Japan and a number of other countries that contributed to the massive project, expected to cost 1.5 billion euros. (SERGEI SUPINSKY/AFP/GettyImages)
General view of the construction site of a first element of protective containment structure in front of the shelter over the destroyed fourth block of the Chernobyl Power Plant on April 26, 2012. Ukraine launched construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. President Viktor Yanukovych pressed a symbolic button at the construction site, watched by workers and ambassadors from China, Japan and a number of other countries that contributed to the massive project, expected to cost 1.5 billion euros. (GENYA SAVILOV/AFP/GettyImages)
A young boy stands in front of Chernobyl victims memorial in Kiev during a memorial ceremony on April 26, 2012. Ukraine launched today construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. (SERGEI SUPINSKY/AFP/GettyImages)
Victims of Chernobyl nuclear accident's widows hold pictures of their late husbands during a memorial ceremony at the Chernobyl victims memorial in Kiev on April 26, 2012. Ukraine launched today construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. (SERGEI SUPINSKY/AFP/GettyImages)
Ukrainian President Viktor Yanukovych presses symbolic button in front of the shelter in front of the shelter over the destroyed fourth block of the Chernobyl Power Plant on April 26, 2012. Ukraine launched construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. President Viktor Yanukovych pressed a symbolic button at the construction site, watched by workers and ambassadors from China, Japan and a number of other countries that contributed to the massive project, expected to cost 1.5 billion euros. (GENYA SAVILOV/AFP/GettyImages)
Workers of Chernobyl nuclear power plant hold candles as they stand in front of the monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012.
A general view of the sarcophagus over destroyed 4th block of Chernobyl power plant on February 24, 2011 ahead of the 25th anniversary of the meltdown of reactor number four due to be marked on April 26, 2011.
A worker of Chernobyl nuclear power plant holds a candle at the monument to Chernobyl victims in Slavutich, some 50 kilometres from the accident site, where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012
A woman lays flowers at the monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, and where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012.
A woman cries as she looks at portraits at the monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, and where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012.
A picture taken on April 26, 2012 shows portraits at a monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, and where many of the power station's personnel used to live, during a memorial ceremony.
A man lights a candle at the monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, and where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012.
People light candles and lay flowers at the monument to Chernobyl victims in Slavutich, some 30 miles from the accident site, and where many of the power station's personnel used to live, during a memorial ceremony early on April 26, 2012.
Ukraine's President Viktor Yanukovych addresses media during a visit to exploded Chernobyl power station on April 20, 2011, few days ahead of the 25th anniversary of the 1986 nuclear explosion on April 26. International leaders pledged hundreds of millions of dollars at a conference in Kiev the day before to complete a permanent shelter to secure the ruins the station.
Employees of the Chernobyl Nuclear Power Plant walk in front of the destroyed 4th block of the plant on February 24, 2011 ahead of the 25th anniversary of the meltdown of reactor number four due to be marked on April 26, 2011.
An employee of the Chernobyl Nuclear Power Plant points out devices in the control room of the destroyed 4th block of the plant on February 24, 2011 ahead of the 25th anniversary of the meltdown of reactor number four due to be marked on April 26, 2011.
A memorial stands outside the Devasted Nuclear plant of Chernobyl on February 24, 2011 ahead of the 25th anniversary of the meltdown of reactor number four due to be marked on April 26, 2011.
A picture of a dog and cello are left in the ghost city of Prypyat, near Chernobyl nuclear power plant on February 24, 2011 ahead of the 25th anniversary of the meltdown of reactor number four due to be marked on April 26, 2011.
Flowers are placed on a sculpture dedica
Flowers are placed on a sculpture dedicated to the memory of the men who liquidated the stricken reactor at the Chernobyl nuclear plant in Kiev during a memorial ceremony on April 26, 2012. Ukraine launched construction of a new shelter to permanently secure the stricken Chernobyl plant as it marked the 26th anniversary of the world's worst nuclear disaster. President Viktor Yanukovych pressed a symbolic button at the construction site, watched by workers and ambassadors from China, Japan and a number of other countries that contributed to the massive project, expected to cost 1.5 billion euros. AFP PHOTO / SERGEI SUPINSKY (Photo credit should read SERGEI SUPINSKY/AFP/GettyImages)
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MARIA DANILOVA 04/26/12 04:59 PM ET Associated Press