UNITED NATIONS (Reuters) – United Nations Secretary-General Antonio Guterres spoke with Ukraine’s President Volodymyr Zelenskiy on Saturday, telling him the world body plans to “enhance humanitarian assistance to the people of Ukraine”, a U.N. spokesperson said. “He informed the President that the United Nations would launch on Tuesday an appeal to fund our humanitarian operations in Ukraine,” the U.N. spokesperson said in a statement. U.N. aid chief Martin Griffiths said on Friday that more than $1 billion will be needed for aid operations in Ukraine over the next three months as hundreds of …