U.S. President Joe Biden will use his remaining months in office to strengthen Ukraine, national-security adviser Jake Sullivan said on September 14. Biden withdrew from the U.S. presidential election in July and will leave office in January. Sullivan said he is "determined to use the four months to put Ukraine in the best possible position to prevail." Speaking virtually to a conference in Kyiv, he said President Volodymyr Zelenskiy "has said that ultimately this war has to end through negotiations, and we need them to be strong in those negotiations," adding that Biden will meet with Zelenskiy at the next UN General Assembly in late September.