U.S. national security adviser Jake Sullivan on Friday warned that a possible Russian invasion of Ukraine could begin "any day now," including during the Beijing Winter Olympics taking place through Feb. 20."We are in the window when an invasion could begin at any time, should Vladimir Putin decide to order it," Sullivan told a press conference, while noting that the U.S. government is not saying that a final decision has been made by the Russian president."I will not comment on the details of our intelligence information, but I do want to be clear, it could begin during the Olympics, despi…READ FULL ARTICLE