Mr. Clinton has said the West must enforce the now-toothless United Nations ban on Serbian flights over Bosnia.

Germany's divided coalition warned a constitutional court today that the Government could collapse over the issue of whether Germans help enforce a ban on Serbian flights over Bosnia and Herzegovina.

We have refused to arm the Muslims, but have done nothing to defend them; we have banned Serbian flights over Bosnia, but there has been no enforcement.

With a toothless study of war crimes and timid surveillance of Serbian flights over Bosnia.

Among those steps are a ban on Serbian flights over Bosnia and a wide-ranging trade embargo against Yugoslavia, in which Serbia is the dominant republic.

Since then, the prospects for any military involvement by NATO in the Bosnian war have evaporated, and the latest Serbian flights predictably prompted no response.

He also seeks enforcement of United Nations resolutions banning Serbian flights and guaranteeing the delivery of aid.

The Bush Administration is divided over whether to press for a United Nations resolution authorizing force to stop the Serbian flights, senior Administration officials said today.

Washington now says it is prepared to seek U.N. authority to enforce the no-fly zone - a worthwhile step to show that the world means what it says about halting Serbian flights.

U.S. Call for Force The ban, intended to halt Serbian military flights, reportedly has been violated more than 300 times by the Serbian forces.