Nato has promised to study a parliamentary report which said that Russia's destabilisation of the Ukraine had exposed "serious deficiencies" in its preparedness to deal with a military threat from its former Cold War adversary.
Oana Lugescu, a spokesperson for the alliance said: “This is an important report and we will study it carefully."
She added that the 28 member states had already taken steps to reinforce collective defense with more planes in the air, more ships at sea, and more exercises on the ground, especially in eastern Europe.
At the Wales Summit in September, she said Nato leaders will adopt an action plan to reinforce the readiness of the alliance to ensure it is able to deal with all the threats it faces.
She added: "We are also considering reinforcement measures, the designation of bases and pre-positioning of equipment and supplies. We are reviewing our defence plans, threat assessments, intelligence-sharing arrangements and early-warning procedures."
More top news
Did the International Space Station take a wrong turn?
The wife of a British aid worker held by Islamic State militants has recorded a message to his captors appealing for his life to be spared.
Even if you're having a tough day in the office, it's unlikely to be as difficult as the one facing the director of the US Secret Service.