Stoltenberg: NATO to increase high-readiness forces

STORY: "We will transform the NATO response force and increase the number of our high-readiness forces to well over 300,000," he told reporters ahead of a NATO summit in Madrid later this week.

NATO's quick reaction force, the NATO response force, so far has some 40,000 troops.

At the Madrid summit, NATO will also change its language on Russia that in the alliance's last strategy from 2010 was still described as a strategic partner.

Stoltenberg said he would meet with the leaders of NATO, Turkey, Finland and Sweden on Tuesday (June 28) before the Madrid summit to discuss the Nordic countries' bids to join the alliance.

"I will not make any promises but I can just reassure that we are working actively to ensure progress," Stoltenberg said.