The president sought to clarify US policy on a possible Russian invasion of Ukraine after his remarks about how the Nato alliance might respond to a 'minor incursion' triggered alarm in Kyiv. Biden told reporters at the White House: 'If any assembled Russian units move across the Ukrainian border, that is an invasion. Let there be no doubt if Putin makes this choice, Russia will pay a heavy price'
US accuses Russia of conspiring to take over Ukraine government