A contingent of U.S. Army paratroopers arrived in Poland on April 23, the first of what will be a "persistent presence" of U.S. troops as the crisis in nearby Ukraine continues to unfold. The company-sized contingent will conduct training exercises with Polish counterparts and is visiting at the request of Poland.
CNN: US troops in Poland as Ukraine crisis persists
Stephen Mull, the U.S. ambassador to Poland, says NATO is obliged to reassure Poland of its security guarantee.
