President Donald Trump has downplayed his war on Iran as “small potatoes,” but those potatoes are getting bigger as both sides are escalating beyond their stalemate in the Strait of Hormuz.

For months, Iran’s military has failed to completely close off the narrow waterway, as U.S. forces shepherd more oil tankers through, eroding Tehran’s geopolitical leverage.

Similarly, the U.S. military has failed to completely reopen the strait, as Iranian attacks on commercial vessels prevent a return to prewar traffic flows, keeping oil prices high.

But with the U.S. naval blockade also strangling Iran’s economy, Tehran was widely expected to try changing the equation with a fresh cycle of attacks—and it did.

Iran launched missiles at U.S. bases around the Persian Gulf earlier this week, then on Saturday it launched missiles at a Navy aircraft carrier and destroyer.