As telling news.sky.com,
Russia has warned Donald Trump that the world will become "more dangerous" if he pulls the US out of a Cold War-era nuclear deal.
The US president has announced his intention to quit the Intermediate-Range Nuclear Forces Treaty, which was drawn up to protect America and its allies in Europe and the Far East, because of alleged violations by Moscow.
The agreement - signed by Mikhail Gorbachev and Ronald Reagan in 1987 - is meant to prohibit the countries from possessing, producing or testing any ground-launched cruise missiles with a range of 300 to 3,400 miles.
Former Soviet leader Mr Gorbachev has said it would be a "mistake" if Washington scrapped the treaty.
Now the Kremlin - which denies not sticking to the deal's terms - says America's withdrawal would "make the world a more dangerous place".
"Russia would be forced to take measures to restore the balance of nuclear power in the event of a US exit from the treaty," said a statement from the Russian capital.
Moscow also pledged that it would "never attack anyone first" with a nuclear strike, following comments by Vladimir Putin that Russians would "go to heaven" as martyrs in case of such a war.
The Kremlin statement added: "We don't feel that we have the right to inflict the first strike."
"The US intention to possibly exit form the treaty is a cause for deep concern. The US itself is in breach of the treaty."