President Vladimir V. Putin warned President Biden on Thursday that any economic sanctions imposed on Russia if it moves to take new military action against Ukraine could result in a “complete rupture” of relations between the two nuclear superpowers, a Russian official told reporters on Thursday evening.

The exchange came during a 50-minute phone call that Mr. Putin requested, and which both sides described as businesslike. Yet it ended without clarity about Mr. Putin’s intentions. He has massed 100,000 or so troops on the border with Ukraine, and issued demands for the North Atlantic Treaty Organization and the United States […]

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By Donato