EMINENTLY IGNORABLE:

Mr. Obama is focused on isolating President Vladimir V. Putin's Russia by cutting off its economic and political ties to the outside world, limiting its expansionist ambitions in its own neighborhood and effectively making it a pariah state.

Mr. Obama has concluded that even if there is a resolution to the current standoff over Crimea and eastern Ukraine, he will never have a constructive relationship with Mr. Putin, aides said. As a result, Mr. Obama will spend his final two and a half years in office trying to minimize the disruption Mr. Putin can cause, preserve whatever marginal cooperation can be saved and otherwise ignore the master of the Kremlin in favor of other foreign policy areas where progress remains possible.

"That is the strategy we ought to be pursuing," said Ivo H. Daalder, formerly Mr. Obama's ambassador to NATO and now president of the Chicago Council on Global Affairs. "If you just stand there, be confident and raise the cost gradually and increasingly to Russia, that doesn't solve your Crimea problem and it probably doesn't solve your eastern Ukraine problem. But it may solve your Russia problem."

The manifestation of this thinking can be seen in Mr. Obama's pending choice for the next ambassador to Moscow. While not officially final, the White House is preparing to nominate John F. Tefft, a career diplomat who previously served as ambassador to Ukraine, Georgia and Lithuania.

When the search began months ago, administration officials were leery of sending Mr. Tefft because of concern that his experience in former Soviet republics that have flouted Moscow's influence would irritate Russia. Now, officials said, there is no reluctance to offend the Kremlin.

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