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>> reporter: president biden asked moments ago when he would be moving more u.s. troops to europe. there are some 8500 on stand-by to go and support nato operations in eastern european nato countries saying that the troops would be moving to europe in the near term. >> ill be moving u.s. troops in the nato countries in the near term. >> reporter: the thousands of u.s. troops heading to europe. we saw a rare joint appearance by two of the most senior load esches at the defense department. it high...