U.S. President Joe Biden expressed "deep concern" over Russia's military buildup near the Ukraine border in a videoconference with his Russian counterpart Vladimir Putin on Tuesday, and warned of a strong response from his country and its European allies in the event of a military escalation, the White House said.The move comes as tensions are mounting over a potential Russian military invasion of Ukraine following Moscow's annexation of Crimea in 2014, with Washington assessing that Putin is "putting in place the capacity" to engage in further military escalation should he decide to do so.…READ FULL ARTICLE