奥巴马梅卡伦：给普京一个月时间

U.S. president Barack Obama and British Prime Minister David Cameron have laid down new markers for Russia, giving Moscow a month to meet their conditions in Ukraine or face further sanctions.

The photo provided by the Council of the European union   shows U.S. President Barack Obama (R) talking with British Prime Minister David Cameron during the G7 summit in Brussels, Belgium, June 5, 2014. (Xinhua/The Council of the European union  )

Cameron said that Moscow must meet three conditions or face sectoral sanctions. The conditions include recognizing Petro Poroshenko’s election as the new leader of Ukraine, stopping arms from crossing the border, and ceasing support for pro-Russian protesters in eastern Ukraine.

Obama said that the G-7 leaders unanimously agree with the steps Cameron outlined. He urged Russian President Vladimir Putin to seize the opportunity to enter into a dialogue with  Poroshenko.

"If Mr. Putin takes those steps then it is possible for us to begin to rebuild trust between Russia and its neighbors and Europe. Should he fail to do so though, there are going to be additional consequences. We will have a chance to see what Mr. Putin does over the next, two, three, four weeks, and if he remains on the current course, then we have already indicated the kinds of actions that we’re prepared to take," Obama said.