Russian President Vladimir Putin, on a boat, inspects the missile cruiser Moskva during a navy parade marking the Victory Day in Sevastopol, Crimea, Friday, May 9, 2014. Putin extolled the return of Crimea to Russia before tens of thousands Friday during his first trip to Black Sea peninsula since its annexation. The triumphant visit was quickly condemned by Ukraine and NATO. (AP Photo / Ivan Sekretarev)The Associated Press

Russian President Vladimir Putin lights a candle in Sevastopol where he attends celebrations marking the Victory Day, in Crimea, Friday, May 9, 2014. President Vladimir Putin hailed the return of Crimea to Russia as the restoration of "historic justice" before a jubilant, welcoming crowd Friday on the holiday that Russians hold dearest. Putin's visit to the Crimean port of Sevastopol, was strongly criticized by both NATO and Ukraine's Foreign Ministry. (AP Photo/RIA-Novosti, Alexei Druzhinin, Presidential Press Service)The Associated Press

NATO Secretary General Anders Rasmussen ,left, meets with Poland's Prime Minister Donald Tusk at the Prime Minister's Office in Warsaw, Poland, Thursday, May 8, 2014. Rasmussen is in Poland for talks with the country's leaders.(AP Photo/Czarek Sokolowski)The Associated Press

BRUSSELS Russia's ongoing confrontation with the West has ignited debate inside and outside the U.S.-led NATO alliance about what its responsibilities are, and how much of its time and effort should be spent to prepare for and if necessary counter Russian President Vladimir Putin's military ambitions.

Ian Lesser, senior director for foreign and security policy at the German Marshall Fund of the United States, said NATO must remain mindful of other modern security challenges, including cyberterrorism, threats to energy supplies and armed Islamic extremism.

But he predicted the trans-Atlantic alliance's focus will shift dramatically because of what he termed the biggest game changer in European security and defense environment in 20 years: Russia's armed aggression in Crimea and the Kremlin's continuing military pressure on Ukraine.

"Today we have a situation in which Russia and especially the Russian leadership is highly unpredictable," Lesser said. "There is something about the current crisis that suggests Russia is a rogue state, with all that would imply for deterrence and reassurance of allies."

As the alliance ponders how to react in Europe after years of fielding operations in the Middle East, Africa and Afghanistan, one of NATO's top commanders told The Associated Press that Russia's demonstrated ability to swiftly mobilize large numbers of troops in so-called snap exercises and Moscow's uncertain intentions have forced a rethink of NATO's capacity to respond and the deployment of its forces.

"What I am thinking about now is, is NATO correctly positioned and is it at the right state of responsiveness?" U.S. Air Force Gen. Philip Breedlove, NATO's supreme commander in Europe, said in a recent interview. "If we expect that Mr. Putin is going to be in charge of Russia for many years, if we are going to see this kind of exercise behavior in the future, are we prepared to react to the next snap exercise that goes across a border to impose its will on another sovereign nation in a different part of Europe? That's what I've been doing a lot of thinking about."

Already, NATO has reinforced its Baltic air patrols, put AWACS surveillance planes in the skies over Poland and Romania, dispatched warships to the Baltic and Black seas and sent 600 U.S. Army paratroopers to Poland and the Baltic states on temporary deployment.

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NATO alliance, facing a more assertive and militarily capable Russia, ponders what to do next