The Biden administration has given Ukraine its full backing as new video showed Russia sending trains filled with tanks and military vehicles into Crimea. Secretary of State Antony Blinken reaffirmed the United States' 'unwavering support' for Kiev as tensions continue to escalate with Moscow. The Kremlin said on Thursday the West should not 'worry' about Russian troop movements on the Ukrainian border,but there are concerns the situation could turn into another conflict.