Russia’s test of a nuclear-powered missile that it claims can’t be stopped by air defenses reflects Moscow’s determination to look out for its security interests, a Kremlin official said Monday, after the United States and European countries increased pressure on President Vladimir Putin to negotiate an end to the invasion of Ukraine .

U.S. President Donald Trump said Putin should focus on making a peace deal, not testing missiles.

Little is known about Russia’s Burevestnik missile, which the NATO military alliance has code-named Skyfall. Putin appeared Sunday in an official video, wearing camouflage fatigues, to hear Russia’s chief of general staff report that the missile had covered 14,000 kilometers (8,700 miles) in a test.

The news came after a week that saw tough new U.S. sanc

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