Western officials suggest Iran tries to wiggle out of nuclear pledges

U.S. Secretary of Energy Ernest Moniz, U.S. Secretary of State John Kerry and U.S. Under Secretary for Political Affairs Wendy Sherman (L-3rd L) meet with Iranian Foreign Minister Mohammad Javad Zarif (2nd R) at a hotel in Vienna, Austria June 28, 2015. REUTERS/Carlos Barria

VIENNA (Reuters) - Iran is backtracking from an interim nuclear agreement with world powers three months ago, Western officials suggested on Sunday, as U.S. and Iranian officials said talks on a final accord would likely run past a June 30 deadline.

Securing an historic agreement would end a more than 12-year nuclear standoff between Iran and the West and open the door to suspending sanctions that have crippled Tehran's economy. It could also help ease the diplomatic isolation for an Iran that has become increasingly assertive across the region.