Russian President Vladimir Putin declared a "partial mobilization" of Russia's armed forces on Wednesday morning

Putin - "Only those citizens will be drafted to military service who are currently in the reserve and first of all those who have served in the army,

Putin's Wednesday announcement also came as his country has struggled to replenish its fighting force in Ukraine and suffered setbacks on the battlefield amid a surging Ukrainian counteroffensive.

In a separate television interview, Defense Minister Sergei Shoigu said Russia would immediately call up 300,000 reservists to "hold the line at the front" in Ukraine.

President Biden said that "Russia has shamelessly violated the core tenets of the United Nations charter" by invading Ukraine.