万斯曾于4月20日访问梵蒂冈，并在前教宗方济各 (Pope Franci)去世的前一天与他会晤。方济各4月21日逝世，享年88岁。此前，他曾因肺炎而住院并且正在恢复中。

WASHINGTON/MOSCOW, May 20 (Xinhua) -- Ceasefire negotiations between Russia and Ukraine "will begin immediately," said U.S. President Donald Trump after his two-hour call with his Russian counterpart, ...