Since the end of the Cold War, foreign policy has become much more challenging. In a post-bipolar world where nonstate actors pose real threats and disrupters (good and bad) are everywhere, the issues are knottier and unforeseen developments often yield difficult options. In the aftermath of 9/11, George W. Bush chose not to come to terms with this fundamental change. Instead, he opted for a blunderbuss policy dominated by a misguided invasion of Iraq. President Barack Obama inherited a helluva cleanup job. And as he had handled the details -- such as winding down the wars in Iraq and Afghanistan -- he has had tried to articulate an overall strategy. His latest stab at this was the speech he delivered to West Point graduates this morning.

Early in the address, Obama noted, "you are the first class to graduate since 9/11 who may not be sent into combat in Iraq or Afghanistan." The young men and women before him cheered. It was a poignant moment. Then Obama proceeded to outline a larger vision. He summed up his stance in these lines:

"[S]ince George Washington served as commander in chief, there have been those who warned against foreign entanglements that do not touch directly on our security or economic well-being. Today, according to self-described realists, conflicts in Syria or Ukraine or the Central African Republic are not ours to solve. Not surprisingly, after costly wars and continuing challenges at home, that view is shared by many Americans.

"A different view, from interventionists on the left and right, says we ignore these conflicts at our own peril; that America's willingness to apply force around the world is the ultimate safeguard against chaos, and America's failure to act in the face of Syrian brutality or Russian provocations not only violates our conscience, but invites escalating aggression in the future.