"There is no immediate threat. NATO does not see the need to revise its nuclear strategy," Stoltenberg said in an interview with Japanese newspaper Yomiuri Shimbun.
Stoltenberg also noted that the process of replacing US fighter jets used for nuclear deterrence from F-16s to F-35s "continues as usual."
In June, Russian President Vladimir Putin said that Russia could make changes to the nuclear doctrine amid discussions in the West on the possibility of lowering the threshold for the use of nuclear weapons. Later, Pentagon Press Secretary Maj. Gen. Pat Ryder said that Washington sees no reason to make changes to its nuclear doctrine.