Russian Deputy Foreign Minister Sergei Ryabkov said today that the risk of nuclear conflict is at its highest level in decades, warning that Moscow is in a “de facto” open conflict with Washington over the war in Ukraine.

He also said there could be no talk of secret or open negotiations with Washington to restore the New START nuclear arms reduction treaty, which Russia withdrew from in February.

Speaking at an event titled “A World Without START: What Happens Next,” Ryabkov said there was “no question” of Russia restoring the treaty for now, criticizing what he called Washington’s “hostile course” toward Moscow.

“I would not like to enter into a debate about whether the probability of a nuclear conflict is high today, but it is higher than anything we have had in recent decades, let’s put it that way,” Ryabkov was quoted as saying by the Interfax news agency.

Ryabkov said Russia was committed to keeping the world “safe and free” from the threat of nuclear war, but added later that it could not continue as usual, as Moscow was now “in a de facto state of open conflict with United States”.