The presence of Russian troops in Ukraine 's Crimea has stirred up tensions . U.S. President Barack Obama appears to have limited options to pressure Russia . A military response is n't considered to be a realistic possibility . Reporters on the ground say the standoff is a strange one . The crisis is affecting global markets , driving up the price of oil and hurting the ruble .
The presence of Russian troops in Ukraine 's Crimea has stirred up tensions . U.S. President Barack Obama appears to have limited options to pressure Russia . A military response is n't considered to be a realistic possibility . The crisis is affecting global markets , driving up the price of oil and hurting the ruble .