Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl,

A child gas mask and a doll are seen inside a kindergarten in the abandoned city of Prypiat near the Chernobyl nuclear power plant April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26

The sarcophagus covering the damaged fourth reactor at the Chernobyl nuclear power plant is seen in the horizon from the balcony of a building in the abandoned city of Prypiat April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26. Engineers are still struggling to regain control of damaged reactors at the Fuskushima plant after last month's earthquake and tsunami, in the worst nuclear crisis since Chernobyl in 1986, with the government urging the operator of the plant to act faster to stop radiation spreading

An empty swimming pool is seen in the abandoned city of Prypiat near the Chernobyl nuclear power plant April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26.

Local resident Ivan Ilchenko, 76, looks at the camera in the village of the Kupovate in the 30 km zone around the Chernobyl nuclear power plant April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26. Engineers are still struggling to regain control of damaged reactors at the Fuskushima plant after last month's earthquake and tsunami, in the worst nuclear crisis since Chernobyl in 1986, with the government urging the operator of the plant to act faster to stop radiation spreading.

Local resident Ivan Ilchenko, 76, walks in a field in the village of the Kupovate in the 30 km zone around the Chernobyl nuclear power plant, April 4, 2011. Belarus, Ukraine and Russia will mark the 25th anniversary of the nuclear reactor explosion in Chernobyl, the place where the world's worst civil nuclear accident took place, on April 26. Engineers are still struggling to regain control of damaged reactors at the Fuskushima plant after last month's earthquake and tsunami, in the worst nuclear crisis since Chernobyl in 1986, with the government urging the operator of the plant to act faster to stop radiation spreading.

Chernobyl: A Nuclear Accident With No End?