Kyiv is not a NATO member and does not benefit from the organizationâs mutual defense pact, but it has received significant assistance in bolstering its defensive capabilities since Russia annexed its Crimea region in 2014.
U.S. and European officials also have been engaged in diplomatic efforts to defuse tensions with Moscow, although there is an impasse over Russiaâs demand that Ukraine and other former Soviet states be barred from joining the Western military alliance.
As the troop buildup continues, hereâs what President Biden and other Western leaders have placed on the line.
What to know
What is President Bidenâs stance on Ukraine?What military help have NATO members promised?Why are NATO allies sending weapons to Ukraine?What diplomatic channels have U.S. allies pursued?