By Trevor Hunnicutt, Andrea Shalal and Kate Holton WASHINGTON (Reuters) -U.S. President Joe Biden and British Prime Minister Rishi Sunak

Vladimir Putin has presided over a rehearsal to deliver what the Kremlin described as a “massive” nuclear strike, including the test launch of multiple ballistic missiles. While Russia holds similar rehearsals every autumn, Wednesday’s show of force came just hours after Moscow’s withdrawal from a significant nuclear test ban treaty and as its invasion of Ukraine approaches its second winter. Footage broadcast on state television showed the Russian president overseeing the annual exercises, dubbed “Grom”, via video call. The purpose of the drill was to “deliver a massive nuclear strike... in response to an enemy nuclear strike”, said defence minister Sergei Shoigu. The Kremlin said a Yars intercontinental ballistic missile was launched from a test site to a target in Russia’s far east, a nuclear-powered submarine launched a ballistic missile from the Barents Sea and Tu-95MS long-range bombers test fired air-launched cruise missiles. Russia, which has the world’s largest nuclear arsenal, has passed a bill in parliament that would revoke its ratification of a key nuclear test ban treaty, the Comprehensive Nuclear Test Ban Treaty (CTBT). Though it has never formally come into force, the CTBT has helped deter nuclear weapons testing around the world, with only North Korea conducting an explosive nuclear bomb test this century. Ukraine has said Russia’s withdrawal of its CTBT ratification was an attempt at “nuclear blackmail”. Mr Putin, who will be sent the bill for final approval, has said revoking Russia’s ratification would “mirror” the stance of the US, which has signed but did not ratify the nuclear test ban. Video footage of Wednesday’s military exercise released by the Russian defence ministry showed the land- and submarine-launched missiles piercing the night sky with loud roars, while nuclear-capable bomber aircraft departed from an airfield under the cover of darkness. “Under the leadership of the supreme commander-in-chief of the armed forces of the Russian Federation, Vladimir Putin, training was conducted with the forces and means of the ground, sea and air components of the nuclear deterrent forces,” the Kremlin said in a statement. “During the training, practical launches of ballistic and cruise missiles took place. The tasks planned in the course of the training exercise were fully accomplished,” it said. The latest developments have raised widespread concerns that Moscow could resume nuclear testing in attempts to discourage the West from continuing to offer military support to Ukraine. Russia’s deputy foreign minister Sergei Ryabkov said earlier this month that Moscow will continue to respect the ban and will only resume nuclear tests if Washington does it first. On Wednesday, Mr Ryabkov said the Russian foreign ministry had received proposals from the US to restart discussions regarding strategic stability and arms control matters. However, he pointed out that, given the current political climate, Moscow does not view it as feasible. “We aren’t ready for it because the return to a dialogue on strategic stability... as it was conducted in the past is impossible until the US revises its deeply hostile policy course in relation to Russia,” Mr Ryabkov told reporters in comments carried by Russian news agencies.

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