Aid agencies in Ukraine say instability in the region is threatening efforts to make the Chernobyl power plant safe for the next 100 years.
Today is the 29th anniversary of the world's worst ever nuclear accident, which affected the lives of more than seven million people.
Adi Roche, voluntary chief executive of Chernobyl Children International, visited the site in recent weeks.
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She said people don't realise that the radioactive material released in 1986 represents just a fraction of the toxic material still inside the crumbling complex:
