NATO agrees on plan to deter growing Russian threat

"We are implementing a balanced package of political and military measures to respond to this threat (from Russia)", NATO Secretary-General Jens Stoltenberg said after the meeting. "This includes significant improvements to our air and missile defenses, strengthening our conventional capabilities with fifth generation jets adapting our exercises and intelligence, and improving the readiness and effectiveness of our nuclear deterrent."

Officials stress that they do not believe any Russian attack is imminent. Moscow denies any aggressive intentions and says it is NATO that risks destabilizing Europe with such preparations.

But diplomats say the "Concept for Deterrence and Defence in the Euro-Atlantic Area" - and its strategic implementation plan - is needed as Russia develops advanced weapon systems and deploys troops and equipment closer to the allies' borders.