By holding nuclear drills and boasting about a successful test of a pioneering atomic-powered cruise missile, Russian President Vladimir Putin is sending a message to President Donald Trump: Moscow won’t be cowed into making concessions on Ukraine.

Facing Trump’s call for a quick ceasefire and bruising, on Russia’s oil industry, Putin is again reminding the U.S. and other Western allies of Kyiv about his nuclear arsenal to back his longstanding, maximalist demands.

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