Ukrainian President Volodymyr Zelenskyy arrived in Washington on Wednesday for his first known overseas trip since the Russia-Ukraine conflict began. He told U.S. Congress that aid to Ukraine was an investment in democracy and "not charity" as he pressed for more assistance in the conflict. The Kremlin said U.S. supplies of Patriot missile systems to Ukraine would not contribute to settling the conflict between Moscow and Kyiv. CGTN reporter Yang Chengxi has more.