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Since the U.S. and Israel launched surprise strikes on Iran last weekend, Washington has been keen to stress that the military action will be over in a matter of weeks and won’t turn into a so-called “forever war.”

But experts say the U.S. could easily get bogged down in “Operation Epic Fury” if the Iranian regime proves more resilient than expected, and that could mean the conflict drags on.

“What we’re seeing is going to be more complicated than the White House may have hoped,” Suzanne Maloney, Brookings Institution vice president and director of foreign policy, told CNBC Tuesday.

“Obviously, the start of the conflict appeared to be tremendously successful with the very quick announcement that Ayatollah Ali Khamenei, the supreme leader of Iran, had been killed, that was a huge breakthrough in many respects and the U.S. and Israel have been able to do immense damage to Iran’s military capabilities.”