President Biden Squares Off With Russian President Putin Over Ukraine

President Biden and President Putin held a two-hour video call discussing the escalation of Russian troops near Ukraine. Biden expressed concerns and warned of swift US response to any military aggression. The call covered military, cyber warfare, and NATO issues. The US supports Ukraine's sovereignty and is prepared to impose economic sanctions targeting Russia's energy sector and key allies if Russia invades. Diplomatic solutions are preferred, but sanctions remain a threat.

What economic measures did the US threaten if Russia escalated the situation?

What role do European allies play in the US's response to Russia's actions?