By Andrea Shalal and Timothy Gardner
WASHINGTON, June 23 (Reuters) - Tehran stands to gain billions of dollars from a 60-day reprieve from U.S. sanctions announced on Monday, but unwinding more than four decades of restrictions poses legal, political and commercial challenges that could take years.
At issue is whether an interim U.S. deal with Iran can translate into lasting economic relief, given the complexity of dismantling a sanctions regime that spans U.S. law, international measures and private-sector risk concerns.