BONN, May 29 (Reuter) - The international community should strive for a political solution to the Bosnian crisis and not rely solely on robust military intervention, German Foreign Minister Klaus Kinkel said on Monday.

"Naturally in addition to military considerations we have to push the diplomatic process," Kinkel told German radio before members of the Contact Group -- the United States, Russia, Britain, France and Germany -- met in the Netherlands.

Kinkel said he believed NATO air strikes against Bosnian Serb ammunition dumps last week were correct, but questioned whether it would be wise to repeat them at this stage.

"One cannot say that more air strikes are off limits, but one will have to consider very carefully how to react," he said. The Contact Group and NATO had to keep their nerve and calmly consider what course of action to take, he added.

He suggested that far-flung and lightly armed U.N. peacekeepers should be gathered into larger groups.

"The problem is simply that the U.N. troops are too vulnerable from a military standpoint. They are too spread out and unfortunately they are relatively unprotected," he said.

"One will have to consider if they can be concentrated in more secure places and given further opportunities for more robust advances and responses."

The unpalatable alternative would be to pull U.N. troops out. Kinkel advised against this, but noted that Bonn had little to say in the matter because it had no soldiers there.

"The question arises: if we cannot protect U.N. troops, then must that lead to a withdrawal? That would be terrible because the military action would only increase," he said.

On the diplomatic front, the world should press Serbian President Slobodan Milosevic to recognise Bosnia, Kinkel said. This would show Milosevic had given up the idea of a greater Serbia and would isolate Bosnian Serb leader Radovan Karadzic.

"We have to make sure that Milosevic does not take the side of the Serbs in Pale. That would be very bad. Naturally he also has to ensure that the (Serbian-Bosnian) border remains closed (to military supplies)," Kinkel said.

"We know very well that the recognition of Bosnia-Herzegovina by Yugoslavia that we urgently need and strive for would represent a major diplomatic breakthrough," he added.