"I think it is a very normal thing that President-elect Donald Trump speaks to world leaders, including of course the leader of Russia," Stoltenberg told reporters on arrival for the second day of the EU Foreign Affairs Council.
He added that NATO's message is "we want dialogue with Russia."
"Russia is our biggest neighbor, Russia is there to stay, and especially when tensions run high, especially when we face many different security challenges, it is important to have chance for political dialogue open with Russia," Stoltenberg stressed. "There's no contradiction between strong defense and political dialogue."
Late Monday, Russian President Vladimir Putin held his first phone conversation with US President-elect Donald Trump.