Asked to provide evidence of Russia's claims, Mr Kelin said: "We perfectly know about [the] participation of British specialists in [the] training, preparation and execution of violence against the Russian infrastructure and the Russian fleet in the Black Sea.Putin 'weakened' after 'catastrophic error' - latest updatesPressed to give evidence to the public on Moscow's accusation the attack on the Russian fleet in the Black Sea was carried out under the guidance and leadership of British Navy specialists, Mr Kelin said it had been handed to the British ambassador and added that "it will become public pretty soon," perhaps today, perhaps tomorrow.A spokesperson said: "In recent days, Russia has made a range of allegations against the UK, clearly designed to distract attention from Russia's illegal invasion of Ukraine; Russia's losses on the battlefield and its bombing of civilian populations and energy infrastructure without any regard for international law and the loss of innocent life."We do not plan to give a running commentary on these allegations; it is no secret that the United Kingdom has taken a public lead in our support to Ukraine - this has been enduring since Russia's illegal annexation of Crimea in 2014."Ambassador denies Moscow would use nuclear weaponsSpeaking after Russia accused the West of "encouraging provocations with weapons of mass destruction", Mr Kelin denied Moscow would use nuclear weapons in Ukraine."