The Kremlin has urged caution in nuclear rhetoric, responding for the first time to US President Donald Trump's announcement that the US is repositioning nuclear submarines.
Kremlin spokesman Dmitry Peskov played down the significance of Mr Trump's comments, saying on Monday that US submarines are already on combat duty and that Moscow does not want to comment further.
Mr Trump said last Friday that he had ordered two submarines to be moved to "the appropriate regions" in response to remarks from former Russian president Dmitry Medvedev about the risk of war between the nuclear-armed powers.
"In this case, it is obvious that American submarines are already on combat duty. This is an ongoing process, that's the first thing," Mr Peskov told reporters.
"But in general, of course, we would not want to get involved in such a controversy and would not want to comment on it in any way," he said. "Of course, we believe that everyone should be very, very careful with nuclear rhetoric."
Mr Peskov said Moscow did not view Mr Trump's statement as an escalation in nuclear tension.
"We do not believe that we are talking about any escalation now. It is clear that very complex, very sensitive issues are being discussed, which, of course, are perceived very emotionally by many people," he said.
He declined to answer directly whether Mr Medvedev, who currently serves as deputy chairman of the Security Council of Russia, was advised to tone down his online altercation with Mr Trump.
"Listen, in every country, members of the leadership... have different points of view on events that are taking place, different attitudes. There are people who are very, very tough-minded in the United States of America and in European countries, so this is always the case," Mr Peskov said.
"But the main thing, of course, is the position of President (Vladimir) Putin. You know that in our country, foreign policy is formulated by the head of state, that is, President Putin."
The spat between Mr Trump and Mr Medvedev flared up after the US president said he is reducing his 50-day deadline for Russia to end its war in Ukraine to less than two weeks.
Mr Medvedev posted on social media that Mr Trump was "playing the ultimatum game with Russia… Each new ultimatum is a threat and a step towards war".
The US president responded: "Tell Medvedev, the failed former Russian president who thinks he is still in power, to be careful what he says. He is entering very dangerous territory."
Medvedev's following post mentioned "Dead Hand," the automatic nuclear retaliation system created during the Soviet era.
Ukraine and Russia continue attacks amid stalled talks
Meanwhile, Russia and Ukraine continue exchanging strikes as peace talks to end the conflict remain stalled.
Ukraine's security service said on Monday that its drones have attacked a Russian military airfield in Crimea, damaging several planes.
The Ukrainian military also claimed it had attacked a Russian fuel depot at Sochi airport the previous day. Russian officials reported on Sunday that an overnight Ukrainian drone attack on an oil depot near the Black Sea resort of Sochi caused a large fire, which prompted authorities to halt flights from the airport.
Ukraine said on Monday its forces neutralised 161 out of 162 Russian drones launched overnight.
As the US deadline for the Russian president to agree to a ceasefire in Ukraine approaches, Mr Trump's Special Envoy Steve Wikoff will be travelling to Moscow on Wednesday for talks.
Ukrainian President Volodymyr Zelensky said Sunday that Ukraine and Russia have agreed to exchange 1,200 prisoners following their latest round of negotiations in Istanbul in July.
Mr Zelensky also said that his office is in communication with US partners and that "pressure on Russia can truly work - in a way that makes them feel the consequences of prolonging the war".
(c) Sky News 2025: Kremlin urges caution in nuclear rhetoric following Donald Trump's submarine announcement