Brexit makes US, Europe less safe

London this week has been anxious under chalky skies with prolonged drizzle, apt conditions for a nation grappling with an unruly process to (probably) depart the European Union. The debate here is largely over how Brexit will affect the political and economic relations between the UK and Europe. Largely ignored, by both Brits and Americans, is how Brexit is a tragic geopolitical loss for the US and the trans-Atlantic alliance.
When the nations of Western Europe operate together they represent a quarter of the world’s gross domestic product and the world’s second-largest defense budget. But individually, none is remotely as important a US partner as they are collectively.
For Nato specifically, there is some good news. The British military, which now tends to divide its participation between EU and Nato missions, will shift to the latter after a Brexit. The bad news: This would make it likely that the French and Germans would simply increase their support for EU military priorities at the expense of Nato. Even if Brexit had a neutral effect in terms of force structure, it would psychologically weaken the alliance overall.
At the darkest end of the spectrum, Brexit could accelerate the overall collapse of the “European project” and the security blanket it provides.
Washington should stay on the sidelines in the British debate. The Trump administration has been vaguely supportive of Brexit, implying the US would provide a new bilateral trade agreement. But, rightly, there have been no concrete steps in that direction. This is an issue that must be decided by the people of Great Britain.
In terms of the EU broadly, the US should be supportive wherever it can — because a unified Europe is in its geopolitical interests. Concrete measures include respecting the young EU diplomatic corps and recognising their missions in world affairs; coordinating with the EU as a block on key issues such as Iranian nuclear proliferation and support for terrorism; sending more American military, intelligence and senior foreign service professionals to meet with European counterparts; and supporting united European interests
at the United Nations and other intergovernmental organisations.
Finally, the White House needs to plan out the policy choices for aiding a newly isolated UK. The biggest threats are not military but economic and diplomatic. In addition to a new free-trade association, US needs to provide Britain with a stronger bilateral military-to-military engagement policy; adapt its intelligence cooperation to make up for what the UK will lose from its former EU partners; and act as an honest broker between the UK and EU until the initial round of mutual resentment and bitterness subsides.
US should do all it can to keep this increasingly unruly band together. But it needs to be better prepared for the security risks of everything falling apart.
—Bloomberg

James Stavridis is a Bloomberg Opinion columnist. He is a retired U.S. Navy admiral and former military commander of NATO, and dean emeritus of the Fletcher School of Law and Diplomacy at Tufts University. He is also an operating executive consultant at the Carlyle Group and chairs the board of counselors at McLarty Associates.