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Why U.S. and Russia Are Sparring Over Ukraine | WSJ

The U.S., NATO and Russia are caught in a diplomatic standoff over Moscow’s buildup of troops at the border with Ukraine. WSJ looks at what Russia wants and how Ukraine and its allies are preparing for a potential crisis. Photo: Andriy Dubchak/Associated Press More from the Wall Street Journal: Visit WSJ.com: http://www.wsj.com Visit the WSJ…