Netanyahu to Obama: Tighten sanctions if Iran defies West

U.S. President Barack Obama meets with Israeli Prime Minister Benjamin Netanyahu in the Oval Office of the White House in WashingtonBy Matt Spetalnick and Dan Williams WASHINGTON (Reuters) – Israeli Prime Minister Benjamin Netanyahu urged President Barack Obama on Monday to step up sanctions on Iran if it pursues its nuclear drive even as Tehran exchanges overtures with Washington and restarts negotiations with the West. Seeking to reassure Israel about the emerging U.S. diplomatic engagement with Iran, Obama said Tehran must prove its sincerity with actions, insisted that Washington would not ease sanctions prematurely and reaffirmed U.S. readiness to resort to military action if all else fails. …