Britain and Germany were as invested.

I have my own theory for Kosovo, and it does not involve such grand scheme as Russia, and even Ukraine is not as big theater as we think, judging the fact that the US abandoned it lately.

In 1993, it is speculated that Berisha, president of Albania, met with Milosevic in Oher, and taking into consoderation that Rugova was very close with Berisha, and Albania violated the embargo by supplying Serbia with oil, it is logical to assume that both Albania and Serbia had a secret pact not to go to war. This way, Serbia comcentrated fully on Bosnian and Croatian theater. I am not sure what Albania got in return, but i guess they probably got a promise that the oppression would cease in the future. All statement of Albania explicitly said that Kosovo was a domestic matter of Yugoslavia. Had a war happened in Kosovo in the 90s, Serbia would risk a lot regarding Bosnia and Croatia, and if anything, logically, Albanians had the best chances to fight and win. After Dayton, they lost such opportunity.

But, then, 1997 unrest happened in Albania and eventually the army was disbanded. At the same time Serbia raided the Jasharis killing every single of them, certainly sparking the war. Albania was at worst aituation possible at the brink of civil war, and i guess Milosevic thought it was time to wipe off Kosovo Albanians once and for all, as there would never be another chance alike.

I assume, the west was aware of whole this, and the Americans were probably informed of any secret pacts Albania had made, if any. It is a fact that America had already pressured Greece back in 1994, when a Greek paramilitary group trained in Cyprus massacred Albanian conscripts in Peshkepi. Americans obliged Greece to arraest such group and compelled both Tirana and Athens to improve relations. Probably the Americans did not wish to back Serbia into a corner in the early 90s when the war spread in Bosnia and Croatia. They probably wanted to settle the whole region, and raise influence in the region by doing such, but not at the cost of one country over another. Yet, as soon as Serbia turned out to be untrustful, it is understandable that all western powers were fed up and would act. Even Russia was fed up, imo, but they could not be publicly against Serbia.

Anyway, this is my approach on what happened, because there is no other explanation that the US, Britain and Germany would be so heavily invested to intervene on behalf of Kosovo so eagerly and even help them become indipendent, a solution which was unthinkable in the early 1990s. No other explanation but a violation of a "secret" pact between Albania and Serbia, in which, the terms were already favorable for Serbia. I mean, a lot of countries and peoples have been subject to efhnic cleansing and no country got as much support as Kosovo. I think Serbia screwed up really bad by signing something, and then violating it sooner than later.