Thousands of Marines backed by advanced U.S. fighter jets and warships are slowly building up a presence in the Persian Gulf. It’s a sign that while America’s wars in the region may be finished, its conflict with Iran over its advancing nuclear program continues to worsen, with no solutions in sight.

The dispatch of the troop-and-aircraft-carrying USS Bataan to the Gulf, alongside stealth F-35 fighters and other warplanes, comes as America wants to focus on China and Russia.