US President Donald Trump has said that nuclear submarines have been deployed in Russia.

"They are in the region, yeah, where they have to be," Trump told reporters before boarding Air Force One in Allentown, Pennsylvania, on Sunday.

When asked if there was anything Russia could do to avoid sanctions at this point, Trump said, "Yeah, get a deal where people stop getting killed." He further said that he was looking for fairness and not leverage when he was imposing tariffs.