Part of this enhanced force will include the establishment of the Spearhead Force, which is expected to include some 5,000 personnel able to be deployed within a few days, Stoltenberg said before the meeting of the North Atlantic Council (NAC) at the defense minister level.
"It is a response to what we are seeing from Russia over a period of time, and it is in full accordance with our international obligations," he added, referring to the crisis in Ukraine that the alliance is blaming Moscow for escalating.
The NATO Response Force (NRF) is a multinational force comprising land, air, maritime and Special Operations Forces elements that can be quickly deployed.
NATO has been strengthening its military presence in Eastern Europe in light of the Ukrainian crisis, accusing Russia of its involvement in the conflict. Moscow has repeatedly denied the allegations and expressed concern over the buildup of NATO forces along its western border.