After decades of tension, NATO and Russia are working together on a series of joint initiatives that range from supplying troops in Afghanistan to fighting airline hijackings.
It is far from certain, however, that the new cooperation to fight immediate and shared threats will help the former Cold War adversaries resolve longer-standing and more fundamental differences over issues such as NATO's eastward expansion or Georgia's relations with its Russian-backed breakaway regions.
Russia, which wants to quash militancy and drug trafficking in its neighborhood, has opened a land route to resupply the 140,000-strong NATO force in Afghanistan and is discussing giving helicopters to Afghanistan's nascent air force and training its anti-drug police.
Recently, Russia and NATO launched a shared system to monitor air traffic above most of the Northern Hemisphere in case of terrorist threats. In the planning stages is a combined anti-missile defense system that would protect all participating nations.
U.S. Adm. James Stavridis, the supreme NATO commander in Europe, told The Associated Press that he would travel to Russia in the fall to discuss missile defense, Afghanistan, counter-proliferation, counterterrorism, and counter-narcotics, among other efforts.
"I am highly interested and actively pursuing zones of cooperation with Russia," he said.
But some observers warn against overplaying the significance of those initiatives, pointing out that unity within the NATO alliance itself has been fraying since the dissolution of the Soviet-led Warsaw Pact nearly two decades ago, which was its only true military rival.
"There are so many splits within NATO and so much of NATO policy has devolved to the member states that I'm not sure whether these improving relations with the alliance mean anything tangible to Russia," said George Friedman, who heads the global intelligence company Stratfor.
Other observers also note that despite the increasingly close ties, an element of distrust still lingers over the relationship.
For example, NATO continues to update contingency plans for the defense of the Baltic states, on Russia's doorstep, although NATO officials say the measure is primarily intended to reassure alliance governments that NATO remains committed to the territorial defense of all member states - its core function since it was founded 60 years ago.
After the end of the Cold War, there were years of improving ties before NATO's bombing of Serbia and Kosovo in 1999, which Moscow strongly opposed.
Cooperation again improved after 2000, only to hit rock-bottom following the Russo-Georgian war two years ago, when the alliance - under pressure from the Bush administration - froze relations with Moscow.
The conflict erupted after Georgian troops tried to regain control over the separatist province of South Ossetia. Russia prevented that and now has troops stationed there and in the like-minded province in Abkhazia. Moscow has recognized the independence of both of them - a move the West has strongly opposed.
Since then, President Barack Obama has announced a "reset" of U.S. ties with Russia, and there has been a significant shift toward cooperation.
In April, Obama and Russian President Dmitry Medvedev signed a new nuclear arms reduction treaty, and in June Russia agreed to support U.N. sanctions against Iran because of its nuclear program. NATO quickly followed suit.
During a visit to Moscow, NATO Secretary-General Anders Fogh Rasmussen said collaboration will continue to grow and lead to the creation of the combined missile defense system by 2020, "which will not only protect us from proliferation but will also bind us together politically as well."
But the anti-missile defenses have yet to be approved by alliance leaders. Some of the 28 member states are skeptical about the proposed system, citing declining defense budgets at a time of economic crisis.
Fyodor Lukyanov, editor of the Russia in Global Affairs magazine, said that ties have progressed more slowly than they could have, largely because of an underlying lack of trust.
"The relationship between NATO and Russia is better than it was two years ago, (but) in order for a real breakthrough to happen, both sides need to change their attitudes," he said.
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Lekic has covered NATO for 4 years. Associated Press writer Khristina Narizhnaya in Moscow contributed to this report.
