President Joe Biden warned Russian President Vladimir Putin Tuesday that further aggression against Ukraine would come with huge costs to the Russian economy "President Biden voiced the deep concerns of the United States and our European Allies about Russia’s escalation of forces surrounding Ukraine and made clear that the U.S. and our Allies would respond with strong economic and other measures in the event of military escalation," the White House said in a statement released after the secure video call that lasted two hours. Biden reiterated his support for Ukraine’s sovereignty and territorial integrity and called for de-escalation and a return to diplomacy, the statement said. Biden’s high-stakes video call with Putin came as U.S. intelligence reports a buildup of Russian troops on Ukraine’s border, raising alarms that an invasion may be imminent. For more on this story, click the link in our bio and subscribe to USA TODAY. #biden #putin #ukraine