The U.S. pursued a "wrong" nuclear policy that led to war in Europe, according to an adviser to the head of Ukrainian President Volodymyr Zelensky's office. Writing on Twitter, Mykhailo Podolyak said the U.S. and other Western nations encouraged Ukraine to give up nuclear weapons as the former Soviet Union collapsed, offering safeguards in return. This was misinterpreted by Russia, leading to conflict, Podolyak said. As the Cold War came to an end, Kyiv possessed a stockpile of nuclear weapons left over from its membership to the Soviet Union. In 1994, Ukraine agreed to surrender these nuclear weapons, although Kyiv...