Tug of War Over Ukraine Intensifies

SIMFEROPOL, Ukraine — Russia's move to seize control of Ukraine's Crimean Peninsula on Saturday led Ukraine to call up its military reserves on Sunday and warn Moscow against further incursions as Western powers scrambled to find a response to the 

Masked gunmen raised the Russian flag and barricaded themselves inside government buildings in the capital of the Crimea region of Ukraine as our colleagues Andrew Higgins and Steven Lee Myers reported.

Russia's Federation Council has unanimously approved President Vladimir Putin's request to use Russian military forces in Ukraine. The move is aimed to settle the turmoil in the split country.

Acting President Oleksandr V. Turchynov, at the left lectern, on Saturday with acting Prime Minister Arseniy P. Yatsenyuk, at the right lectern. Credit Andrew Kravchenko/Ukraine Prime Minister Press Service, via Agence France-Presse — Getty Images.

MOSCOW — Russian gunmen on the Crimean peninsula and the embattled new Ukrainian government in Kiev continued to escalate a dangerous confrontation Sunday, with both sides mobilizing armed forces and warning that the other was provoking war.