Russia has successfully tested an experimental nuclear-powered cruise missile, President Vladimir Putin said Thursday, while also warning that the country’s parliament could revoke its ratification of a treaty banning nuclear tests.

In a speech at a forum of foreign policy experts, Putin announced that Russia has effectively completed the development of the Burevestnik cruise missile and the Sarmat heavy intercontinental ballistic missile and will work on putting them into production.

“We conducted the last successful test of the Burevestnik nuclear-powered global-range cruise missile,” he said without elaborating. His statement was the first announcement of a successful test of the Burevestnik, which translates as “Storm Petrel.” It was first mentioned by Putin in 2018.

Little is known about the Burevestnik, which was code-named Skyfall by NATO, and many Western experts have been skeptical about it, noting that a nuclear engine could be highly unreliable.

It is believed to be able to carry a nuclear warhead or a conventional one, and potentially could stay aloft for a much longer time than other missiles and cover much more distance, thanks to nuclear propulsion.

The United States and the Soviet Union worked on nuclear-powered rocket engines during the Cold War, but they eventually shelved the projects, considering them too hazardous.

The Burevestnik reportedly suffered an explosion in August 2019 during tests at a Russian navy range on the White Sea, killing five nuclear engineers and two servicemen and resulting in a brief spike in radioactivity that fueled fears in a nearby city.

Russian officials never identified the weapon involved, but the U.S. said it was the Burevestnik.

In the speech, Putin noted the United States has signed but not ratified the 1996 Comprehensive Nuclear Test Ban, while Russia has signed and ratified it. He argued that Russia could mirror the stand taken by Washington.

“Theoretically, we may revoke the ratification.” he said.

Moscow last tested a nuclear weapon in 1990, before the collapse of the Soviet Union a year later. It ratified the global test ban in 2000.

Putin’s statement comes amid widespread concerns that Russia could move to resume nuclear tests to try to discourage the West from continuing to offer military support to Ukraine after the Kremlin sent troops into the country. Many Russian hawks have spoken in favor of resuming the tests.

Putin said that while some experts have talked about the need to conduct nuclear tests, he hasn’t yet formed an opinion on the issue.

“I’m not ready to say yet whether it’s necessary for us to conduct tests or not,” he said.
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