The top of the world is a geopolitical Thunderdome

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In the wake of Finland's and Sweden's accession to the North Atlantic Treaty Organization, the alliance can take a well-deserved victory lap. I commanded troops from both nations in Afghanistan, and Swedish forces in the Libyan campaign of 2011. The countries have professional and motivated personnel equipped with superb technology systems, from advanced fighter jets to stealthy naval corvettes.

This spells trouble for Russian President Vladimir Putin's military, already much depleted by its misadventure in Ukraine. Both new members have painful historical experiences with Russia. Finland comes with 800 miles of NATO border the Russians will have to plan to defend. If Putin were to invade Estonia, for example, he would now be vulnerable to being flanked through previously neutral Finland, seriously complicating his military calculus.

One aspect of the Sweden-Finland accession gaining little geopolitical attention — when all is focused on Ukraine — is how they will add to NATO's strength in the Arctic. When I visited the Nordic states a decade ago as the alliance's supreme allied commander, their defense chiefs gave me a demonstration of their winter capabilities — their mastery at operating in what our Canadian allies call the High North, above the Arctic circle. I came away deeply impressed.

So, given the new members, what would a coherent NATO strategy for the increasingly important Arctic look like?

Step back and look at the geography. The top of the world is a geopolitical Thunderdome, with the prize of the Arctic Ocean at the center. As global warming removes more and more of the ice cover, access to vital shipping routes and hydrocarbons — oil and gas — will be increasingly crucial for the nations on the front porch of the Arctic Sea. (My Bloomberg Opinion colleague Liam Denning, newly returned from the region, is doing an excellent series of articles and videos on all this.)

Before his invasion of Ukraine, Putin was increasing the Arctic capability of Russia's military. More troops, bases and ships were added within the Arctic circle. Given the immense losses he has suffered in Ukraine, this effort will likely slow, giving NATO leverage and an opportunity. The alliance should form a smaller "Arctic Coalition" within NATO to focus in increasing its defensive capability to the north.

This coalition should include a well-staffed center devoted to study and analysis of defensive activities in the harsh conditions. Logically and symbolically, this should be based in the territory of one of the two new allies.

The alliance should also develop a detailed defensive plan for responding to Russian activities in the north. NATO has elaborate defensive plans for dealing with attacks by Russia against the Baltic nations, Turkey and Black Sea countries — it needs a similar war plan for the High North, to be rigorously tested in tabletop exercises and real-world operations.

NATO can also increase its routine surveillance and patrol activities in the region. This should include regular under-ice nuclear submarine patrols by the U.S. and U.K.; more satellite time devoted to surveilling the polar region; increased overflight by long-range maritime patrol aircraft operating out of Iceland, Canada and Sweden; and ground-based, long-dwell radar systems on Greenland and other northern locations.

Finally, NATO should conduct regular, large-scale combat exercises under realistic conditions. Warfighting is very different at 50 degrees Fahrenheit below freezing. Every relevant NATO combat system — from missiles to rifles to radars to warships — should be evaluated for its efficacy Arctic conditions.

Adding Sweden and Finland is a very positive step for NATO for many reasons — geography, military capability, advanced technology, European unity. But it also signals much more capability to operate in the Arctic. The alliance should think carefully and act swiftly to capitalize on this northern windfall while Russia's attention is elsewhere.