There was also an ideological side to it, the internationalists made an example of Serbia, basically saying "this is what happens to you when ethno-nationalists in Europe get too uppity and try to stand up to us" (they were willing to indulge Albanian ethno-nationalism to do so, since they perceived the Kosovars as significantly weaker and less of a threat - I wonder what they would have done if the Kosovars had the upper hand)?
good insight - thanks