Correct. UN Resolution 1199 voiced "grave concern...[by] the excessive and indiscriminate use of force by Serbian security forces and the Yugoslav Army." Some 230,000 Albanians had been displaced from their homes, including approx 30.000 who were hiding in woods but without shelter or warm clothing, and with winter just around the corner.
Yes, Serbia was a sovereign nation but it had a history of ehnic cleansing. Given the likelihood of that occurring again, and with Belgrade seemingly embarking on an an all-out assault against ethnic Albanians, it was deemed necessary for NATO to intervene.