A convoy of Russian armored vehicles moves along a highway in Crimea, Tuesday, Jan. 18, 2022. Russia has concentrated an estimated 100,000 troops with tanks and other heavy weapons near Ukraine in what the West fears could be a prelude to an invasion. The Biden administration is unlikely to answer a further Russian invasion of Ukraine by sending U.S. combat troops. But it could pursue a range of less dramatic yet still risky options, including giving military support to a post-invasion Ukrainian resistance. (AP Photo)
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