One of the reasons that the USA decided to use "coalitions of the willing" rather than NATO was their unhappy experience with the war on Serbia where targets had to be cleared by the alliance and various European countries limited the number and quality of targets (I know about France blocking the bombing of the bridges of Belgrade, and of Italy blocking other stuff, but i'm sure others did the same)

But to get back to Sargon's point, one of the scariest moments in the past 20 years was in late 1990 when newly united Germany and France went their separate ways to recognize Croatia and support Belgrade, respectively, in an ugly reminder of 1914. Things calmed down quickly between France and Germany, but not within Yugoslavia, with the terrible price we know.

In the long run, we're all dead. John Maynard Keynes