I do not know if later studies have shown otherwise, but at the time the reason given was that the Kosovo conflict was a continuation of the wars that happened after the breakup of Yugoslavia.
The Bosnian War had raged from 1992 to 1995, and had stopped only after the NATO led an air campaign against the Serbian backed faction, and that only after a more ...
Chechnya and Russia's multi-ethnic confederated nature.
Russia hates the idea of independence movements and especially their success/recognition, given it is itself a confederation of ethnic areas some of which aren't all to happy to be in the confederation. The main parallel is Chechnya - which is also a rebellious Muslim-majority province trying to gain ...
In Albanian-majority areas, it's safe to say: Serbia has no control whatsoever.
In the Serbian enclaves in Kosovo, particularly in Northern Mitrovica, which held its own referendum in 2012, unrecognized by Kosovo or the EU, ... any control Serbia might have is rather unofficial, i.e. at the level of influence. But this is fairly extensive:
In northern ...
The Brussels Agreement (in order for each to join the EU at a later date) laid out several items that the minority Serbian populations within Kosovo would retain control over. Particularly:
There will be an Association/Community of Serb majority municipalities in Kosovo.
The Association/Community will have full overview of the areas of economic ...
The bond between Serbia and Russia today is especially linked towards the war:
Here Nato went into what Russia would say was sovereign territory and played an active role in that war against the Serbs.
Anyway, the only thing I would say is "in it for Russia" is to have ...
As explained in Why does Russia back Serbia?, Serbia has a "brotherly" relationship with Russia. Russia considers itself as the "guarantor of security" for the sake of "Slavic" brotherhood.
The Serbian general population also has an antagonistic attitude toward the USA.
The USA helped Kosovo to teach Serbia a lesson.