A Russian TV personality claimed they could destroy the UK with an underwater detonation.

As more countries sanction Russia and send aid to Ukraine as they weather Russia’s ongoing invasion, Russian officials and TV personalities have begun threatening these countries with direct retaliation should their aid to Ukraine continue. The latest example of this came on Sunday night, when Russian TV personality Dmitry Kiselyov suggested Russia could destroy the United Kingdom with an underwater detonation of nuclear weapons.

Kiselyov suggested that an underwater detonation would result in a “nuclear tsunami” that would completely destroy the UK. “This tidal wave is also a carrier of extremely high doses of radiation,” he said. “Surging over Britain, it will turn whatever is left of them into radioactive desert, unusable for anything. How do you like this prospect?”

Kiselyov also suggested the use of Sarmat 2 intercontinental ballistic missiles, which could carry up to 10 nuclear warheads at once, against the UK, United States, and European countries.

“Why do they threaten vast Russia with nuclear weapons while they are only a small island? The island is so small that one Sarmat missile is enough to drown it once and for all,” Kiselyov said.

Officials have dismissed Kiselyov’s words as an empty threat, as a nuclear weapon would need to have 200,000 times that of the Tsar Bomba, one of the largest nuclear weapons ever created, to cause the kind of environmental impact that he describes. Even so, officials are keeping constant watch over Russia’s nuclear sectors.

“We continue to monitor their nuclear capabilities every day the best we can and we do not assess that there is a threat of the use of nuclear weapons and no threat to NATO territory,” a US official said in a statement last week.