Yemen’s Houthis claim to have a new, hypersonic missile in their arsenal, Russia’s state media reported Thursday, potentially raising the stakes in their ongoing attacks on shipping in the Red Sea and surrounding waterways against the backdrop of Israel’s war on Hamas in the Gaza Strip.

The report by the state-run RIA Novosti news agency cited an unnamed official but provided no evidence for the claim. It comes as Moscow maintains an aggressively counter-Western foreign policy amid its grinding war on Ukraine.

However, the Houthis have for weeks hinted about “surprises” they plan for the battles at sea to counter the United States and its allies, which have so far been able to down any missile or bomb-carrying drone that comes near their warships in Mideast waters.

Meanwhile, Iran and the US reportedly held indirect talks in Oman, the first in months amid their long-simmering tensions over Tehran’s rapidly advancing nuclear program and attacks by its proxies.

Iran, the Houthis’ main benefactor, claims to have a hypersonic missile and has widely armed the Houthis with the missiles they now use.

Adding a hypersonic missile to their arsenal could pose a more formidable challenge to the air defense systems employed by America and its allies, including Israel.

“The group’s missile forces have successfully tested a missile that is capable of reaching speeds of up to Mach 8 and runs on solid fuel,” a military official close to the Houthis said, according to the RIA report.

The Houthis “intend to begin manufacturing it for use during attacks in the Red Sea and the Gulf of Aden, as well as against targets in Israel.”

Mach 8 is eight times the speed of sound.

Russia has maintained close ties with Iran, relying on Iranian bomb-carrying drones to target Ukraine.

Hypersonic weapons, which fly at speeds higher than Mach 5, could pose crucial challenges to missile defense systems because of their speed and maneuverability.

The danger from a hypersonic missile depends on how maneuverable it is. Ballistic missiles fly on a trajectory in which anti-missile systems like the US-made Patriot can anticipate their path and intercept them.

The more irregular the missile’s flight path, such as a hypersonic missile with the ability to change directions, the more difficult it becomes to intercept.

China is believed to be pursuing the weapons, as is America. Russia claims it has already used them on the battlefield in Ukraine.

However, speed and maneuverability isn’t a guarantee the missile will successfully strike a target. Ukraine’s air force in May said it shot down a Russian hypersonic Kinzhal missile with a Patriot battery.