To say that the European members of NATO should spend 2 percent of their GDP on defense, as they agreed at the alliances 2014 summit in Wales, is to state the obvious; but increases in defense spending alone will not revitalize NATO. The alliances future hinges on the key question of strategic consensusthat is, a deeply internalized recognition of the threats confronting the allies.

The last twenty-five years have offered ample reason for pessimism that NATO can agree on a unifying purpose. However, today for the first time since the end of the Cold War, the alliance seems to have enough of a shared security optics to begin to forge an enduring common threat assessment.

At first blush, guarded optimism about NATOs future may seem counterintuitive, as for years the alliance has come up short when it comes to resources and a shared strategic vision. Debates in NATO on what to prioritize continue unabated. Still, two issues are rising fast to the top of the organizations agenda: regionally, a resurgent and geostrategically assertive Russia; and globally, the accelerating threat of Islamic terrorism.

These two topics offer a unique opportunity for NATO to align the security outlooks of key European members with that of the United States. It appears that the next NATO summit, in Brussels in May 2017, may deliver a strategic vision thatmuch as during the Cold Warwill condense a common understanding of NATOs mission into a clearly articulated set of goals that publics will embrace.

Notwithstanding the doom and gloom of op-eds and commentaries predicting NATOs twilight, the United States and its European allies have already delivered a remarkably coordinated response to Russian pressure along the alliances Eastern flank, in both political and military terms. The presence of the U.S. Armored Brigade Combat Team in Poland and the impending deployments of NATO multinational battalions in the Baltics are a breakthrough in how the United States and NATO operate in Central Europe, even if the current reinforcement of the flank remains a work in progress. The deployments demonstrate that allies recognize the geostrategic shift occurring on Europes doorstep in the wake of Russias March 2014 seizure of Crimea and the ongoing war in eastern Ukraine, and can respond in unison.

Likewise, terrorist strikes in Europe and the United States have generated a significant change in how the threat of Islamic terrorism is perceived on both sides of the Atlantic. U.S. and European leaders have identified jihadist terrorism as a direct threat, with U.S. President Donald Trump calling for an all-out effort to defeat the self-proclaimed Islamic State, French President Franois Hollande declaring his country to be at war after the November 2015 Paris terrorist attacks, British Prime Minister Theresa May warning that the UK faces the same terrorist threats as France, and Chancellor Angela Merkel calling terrorism the greatest threat to Germany. Similar sentiments have been echoed across other NATO capitals.

Since the end of the Cold War, NATO has been searching for its existential raison dtre, but various formulas such as out of area, smart defence, and comprehensive approach have come up short in large part because of allies divergent views of security.

Arguably, the biggest missed chance for NATO came in the wake of the 2001 terrorist attacks in New York and Washington, when the alliance invoked Article 5 of the NATO treaty in defense of the United States. Back then, it seemed for a moment that a new collective mission was staring NATO in the face, for it should have been clear that global Islamic terrorist networks were only just beginning to grow in strength. And yet, the subsequent War on Terror and the Overseas Contingency Operations pursued by the United States never germinated into a shared strategic mission, even though the alliance took the lead role in the International Security Assistance Force in Afghanistan.

Today, NATO has arguably the greatest chance since the end of the Cold War to foster a strategic consensus around its two common threats: Russias renewed geostrategic assertiveness along NATOs Eastern (and, increasingly, Southern) flank, and the surge of Islamic terrorism. The key deliverable for the next NATO summit should be a strategy on Russia and terrorism, and allies should start working on it posthaste. Achieving this goal, in addition to increasing defense spending, would go a long way toward strengthening alliance cohesion.

Andrew A. Michta is the dean of the College of International and Security Studies at the George C. Marshall European Center for Security Studies. Views expressed here are his own.

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A Common Threat Assessment for NATO? - Carnegie Europe