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Amid the recent tensions, the United States notified Turkey that two U.S. warships would sail to the Black Sea on April 14 and April 15 and stay there until May 4 and May 5.
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The U.S. warship Porter steamed into the Black Sea days after Russia conducted a "snap readiness check" of its regional forces.
NATO Secretary-General Jens Stoltenberg used an unprecedented address to Congress on Wednesday to acknowledge strains in the pact and to pressure Russia to return to compliance with the Intermediate Nuclear Forces Treaty.
By Joe Gould