Greenpeace has warned of a potential collapse of the internal radiation shelter at the Chernobyl nuclear power plant, risking a release of radioactivity into the environment. This warning comes ahead of the 40th anniversary of the Chernobyl disaster. The plant, which exploded in 1986, has seen structural degradation due to recent attacks, particularly from Russia. The International Atomic Energy Agency confirmed that the protective structure has lost its safety functions. Experts estimate €500 million is needed for repairs to prevent further risks.