Russian Buildup Stokes Worries

REPORT: Nearly 50,000 Russian Troops Amassing Near Ukraine
A Russian tank rolls outside a former Ukrainian military base in Perevalnoye, near the Crimean capital Simferopol, on March 27, 2014. Ukraine asked today the UN General Assembly to deter the risk of any future Russian aggression by adopting a resolution denouncing its annexation of Crimea. AFP PHOTO/ DMITRY SEREBRYAKOV (Photo credit should read DMITRY SEREBRYAKOV/AFP/Getty Images)
A Russian tank rolls outside a former Ukrainian military base in Perevalnoye, near the Crimean capital Simferopol, on March 27, 2014. Ukraine asked today the UN General Assembly to deter the risk of any future Russian aggression by adopting a resolution denouncing its annexation of Crimea. AFP PHOTO/ DMITRY SEREBRYAKOV (Photo credit should read DMITRY SEREBRYAKOV/AFP/Getty Images)

WASHINGTON—Russian troops amassing near Ukraine are actively concealing their positions and establishing supply lines that could be used in a prolonged deployment, ratcheting up concerns that Moscow is preparing for another major incursion and not conducting exercises as it claims, U.S. officials said.

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