Red Cross volunteers help new arrivals as they cross the border from Ukraine into Kroscienko, Poland This comes as Ukrainian President Volodymyr Zelenskyy denied Russia's accusation that Ukraine is preparing to fight back with chemical or biological weapons, and he said the accusation itself was a bad sign. "No chemical or any other weapon of mass destruction has been developed on my land. The whole world knows this", Zelenskyy said in his latest video statement released late Thursday.