Vladimir Putin has warned Joe Biden there would be a complete breakdown in relations between Russia and the United States if new sanctions were imposed because of tensions in Ukraine.
The Russian president said it would be a “colossal mistake” in a phone call with his US counterpart that ended early on Friday morning.
The two leaders spoke for 50 minutes after Putin requested the conversation, their second direct call this month.
Biden said economic measures would be taken if Russia were to invade Ukraine, where there has been a steady build-up of Russian troops on the border in recent weeks.
The Kremlin has demanded a firm guarantee that Ukraine will never join NATO and the alliance will not position military equipment in former Soviet states,
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