NATO MOVES AHEAD ON A KOSOVO FORCE OF 50,000 TROOPS
NATO approves plans for heavily armed peacekeeping force of about 50,000 soldiers for Kosovo, part of broad drive by NATO's top commander to increase political and military pressure on Yugoslav Pres Slobodan Milosevic; plan, which comes as Gen Wesley K Clark begins pushing to broaden bombing strikes, calls for troops to enter Kosovo only after Serbian troops are withdrawn; would station about 30,000 troops, including soldiers from United States, Britain, France and Germany in Macedonia, positioning allies to move swiftly into Kosovo if settlement is reached; some officials say forces could also play combat role if NATO later decides on land attack (M)

