WASHINGTON — President Obama will not insist on a United Nations resolution threatening to use force to ensure that Syria lives up to its commitment to turn over chemical weapons, but will seek other tangible consequences for Syria if it does not comply, senior administration officials said Friday. Although Mr. Obama reserves the right to order a punitive military strike on his own without United Nations backing if Syria reneges, the officials said he understood that Russia, because of its veto power in the Security Council, would never allow a resolution that authorized such a use of force. France, which...