Sorry. But the article you cited stated that the Brits helped the Slovenians by providing equipment. The recognized Slovenia after they seceded from the Yugoslav federation in 1991. The Yugoslav Army tried to enter Slovenia in an effort to put down the secession. However, in large part due to this military aid provided by Britain, they were unsuccessful.
I see no evidence from this article that the Slovenians did anything other than defend their newly declared independent state.
Now if your POV is such that an independent Slovenia is a bad thing, then the actions of the Slovenian Army would be bad. If your POV is such that an independent Slovenia is a good thing, then the actions of the Slovenian Army would be good. In neither case is there any case to be made that they participated in any "ethnic cleansing" or "genocide" that involved Bosnia-Herzagovina, or, more to the point of this thread, any atrocities that impacted Kosovar Muzzies.
Now if the Slovenes attacked the Yugoslav border guards and cut off electricity, heat, and water to the barracks, that is entirely justifiable after Slovenia seceeded from Yugoslavia. Particularly if the Yugoslav border guards refused to leave the borders of the newly formed state of Slovenia. (Again, otoh, if you believe that their declaration of secession from Yugoslavia was illegitimate, then any actions to defend that declaration would also be illegitimate) -- however, cutting off electricity, heat, and water would hardly be considered any sort of "war crime."
Pardon my slovenscino, this is utter bull. According to Charter of Helsinki and Charter of Paris, no violent redrawing of European borders is allowed.
Secessionist Slovenia has breached the key legal framework of European security and set the Balkan dominoes in motion.
Not quite. The YA was a federal institution, therefore, the troops had been stationed in all six republics since the end of WWII. The reinforcements were sent in only after the TO (Territorial Defence; a Yugoslav equivalent of the U.S. National Guard structure) had attacked the barracks and taken over the external borders of Yugoslavia (the Yugoslav-Italian & the YU-Austrian stretch of the border in the Socialist Republic of Slovenia). The YA acted in accordance with the Yugoslav Constitution ("preservation of the territorial integrity").
The YA was at the disposal of the Federal Executive Council, which, through the Supreme Command (consisting of representatives from all 6 republics), commanded the troops.