Obama and Cameron draw line on Ukraine

BRUSSELS, Belgium - President Obama and British Prime Minister David Cameron laid down new markers for Russia on Thursday, giving Moscow a month to meet their conditions in Ukraine or face further sanctions.

The new thresholds for action were spelled out at a joint news conference, following a Group of Seven world leader summit that was rearranged to exclude Russian President Vladimir Putin after his aggressive moves in Ukraine. The U.S. and Europe also have imposed economic sanctions.

To avoid even harsher sanctions, Cameron said, Putin must meet three conditions: recognize Petro Poroshenko's election as the new leader in Ukraine, stop arms from crossing the border, and cease support for pro-Russian separatist groups concentrated in eastern Ukraine.

"If these things don't happen, then sectoral sanctions will follow," Cameron said, standing before a row of U.S. and British flags. "The next month will be vital in judging if President Putin has taken these steps. And that is what I will urge President Putin to do."

Obama said the G-7 leaders unanimously agree with the steps Cameron outlined. But they were not so explicit in written statements issued after two days of meetings, and an Obama aide later described the potential sanctions in terms different from Putin's.

"If Mr. Putin takes those steps, then it is possible for us to begin to rebuild trust between Russia and its neighbors and Europe," Obama said. "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've already indicated the kinds of actions that we're prepared to take."

Obama acknowledged that so-called sectoral sanctions, which would hit key sectors of Russia's economy, could have a bigger impact across Europe because of economic ties to Russia, and said he didn't necessarily expect all European countries to agree on them. But, he said, "it's important to take individual countries' sensitivities in mind."

"My hope is, is that we don't have to exercise them because Mr. Putin's made some better decisions," Obama said.

Obama foreign policy adviser Ben Rhodes later said it wasn't certain that sectoral sanctions would be the punishment of choice. "We'll be calibrating those based on what the situation is," Rhodes said. He spoke to reporters as Air Force One flew to Paris, where Obama had dinner with French President Francois Hollande, who planned a second dinner with Putin so the U.S. and Russian leaders would not have to cross paths.

The White House said Obama and Putin may have an opportunity to speak when both attend events Friday commemorating the 70th anniversary of the D-Day invasion in Normandy.

"There is a path on which Russia has the capacity to engage directly with President Poroshenko now. He should take it," Obama said his message to Putin would be. "If he does not, if he continues a strategy of undermining the sovereignty of Ukraine, then we have no choice but to respond."