Ronald D. Asmus

After the Cold War, NATO and the EU opened their doors to central and eastern Europe, making the continent safer and freer than ever before. Today, NATO and the EU must articulate a new rationale for enlarging still further, once again extending democracy and prosperity to the East, this time in the face of a more powerful and defiant Russia.

Despite the myriad setbacks of recent months, the U.S.-European alliance is not doomed. But repairing it will require a strategic overhaul no less bold than that which followed the end of the Cold War. The key to today's transatlantic divide is not power but purpose. To revive and revamp the alliance, therefore, the United States and the European Union must forge a new grand strategy capable of meeting the great challenges of the era: expanding the Euro-Atlantic community and stabilizing the greater Middle East.

How NATO handles countries that do not make the cut is as important as which ones it admits in the first round of enlargement. Failure to bind the have-nots to Europe could trigger nationalist backlash and backsliding on reform.