Ukrainian President Volodymyr Zelensky appealed to world leaders to keep his country’s fight against Russia’s invasion a top priority in his address to the UN General Assembly on Wednesday. He raised to spectre of a global nuclear disaster at the start of his speech, saying Russia was “planning attacks on our nuclear power plants” in order to further hobble Ukraine’s energy supply. He cited an “alarming” intelligence report but did not disclose further details. “Any missile or drone strike, any critical incident in the energy system, could lead to a nuclear disaster,” Zelensky said. “A day lik…