Oil prices have jumped amid the latest outbreak of hostilities between the United States and Iran over the Strait of Hormuz.

Brent crude, the main international benchmark, rose more than 4 percent on Monday as the US and Iran traded attacks amid their escalating standoff over control of the critical waterway.

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Brent futures for September delivery stood at $78.82 a barrel as of 08:00 GMT, the highest since June 22.

The US Central Command (CENTCOM) said on Sunday that it had carried out dozens of strikes on Iran to degrade its ability to attack vessels in the strait, hours after striking hundreds of targets in the country.

US forces launched the earlier round of strikes after accusing Iranian forces of “blatantly” attacking a Cyprus-flagged container ship, the MV GFS Galaxy, as it was transiting the strait.

“The Strait of Hormuz is a vital maritime corridor for global trade. Iran does not control it,” CENTCOM said in a statement late on Sunday.

“US forces are postured and prepared to ensure that freedom of navigation remains available to commercial shipping despite Iran’s continued unwarranted aggression, harassment, threats, and arbitrary declarations.”

Iranian forces on Sunday launched a wave of missile and drone attacks against the United Arab Emirates, Qatar, Kuwait, Oman and Bahrain in response to the US strikes.

Iran’s Persian Gulf Strait Authority, which claims the right to control traffic through the Strait of Hormuz, earlier reiterated that vessels attempting to cross the waterway without using its preferred route would “not be covered by safe passage guarantees”.

“The consequences arising from transit through unauthorized routes shall be the responsibility of the owner, operator, and vessel commander,” the authority said.

After ticking up following Washington and Tehran’s signing of a memorandum of understanding on ending the war last month, maritime traffic in the Strait of Hormuz has declined sharply amid renewed fighting between the two sides.

Just six vessels were tracked crossing the strait between 18:00 GMT on Thursday and 06:00 GMT on Friday, compared with 18-22 daily crossings earlier this month, according to maritime intelligence platform Windward.

Nine vessels were tracked in the waterway between 18:00 GMT on Saturday and 06:00 GMT on Sunday, four of which were flying the Iranian flag, according to Windward.

Roughly 130 vessels transited the strait, a conduit for one-fifth of the global oil trade in peacetime, each day before the start of the war.

Oil prices, which had returned to pre-conflict levels following the signing of the memorandum on June 17, are now about 9 percent higher than before the US and Israel launched their initial strikes on Iran in late February.

Mukesh Sahdev, founder and chief oil analyst at XAnalysts in Sydney, Australia, said he expects the per-barrel price of Brent to remain in the upper $70s during August and September amid heightened geopolitical uncertainty.

“There could be occasional spikes and dips outside that range,” Sahdev said in a note to clients on Saturday.

“Long-haul procurement forces refiners to make supply decisions weeks in advance,” Sahdev added.

“Those decisions have already reduced immediate reliance on the Middle East, and the latest escalation is likely to reinforce rather than reverse that trend.”

Fabien Yip, a market analyst at IG in Sydney, Australia, said prices are unlikely to approach the much higher levels seen earlier in the war despite the latest turmoil.

“Oil’s return towards pre-war levels in June reflected markets pricing in a best-case outcome for the fragile US-Iran arrangement; last week’s re-escalation exposes how fragile that assumption was,” Yip said in a note to clients on Monday.

“Near-term, the risk premium should keep prices supported, though a repeat of the earlier spike appears unlikely, as demand remains slow to recover while stranded-tanker releases and OPEC+ output quota expansion continue to add barrels to an already oversupplied outlook.”

Major Asian stock markets fell on Monday amid the renewed fighting in the Middle East.

Japan’s benchmark Nikkei 225 closed nearly 2 percent lower, while South Korea’s Kospi plunged 9 percent.

Hong Kong’s benchmark Hang Seng Index rose slightly, finishing up about 0.2 percent.