Only Serbia was a NATO action - taken after many warnings were ignored.
Warnings invented by NATO leading powers for invented reasons, in situation when state of Serbia reacted to defend from terrorists and rebellion on its territory, as would do any state in the world.
Proof? Just go google on UCK (Albanian military organization). Before NATO intervention it was in official NATO documents classified as terrorist organization. After NATO intervention, UCK in same those documents becoming liberation army.
See? When NATO founds interest, terrorists suddenly becoming useful tool.
Or, think how Britain gave itself right to intervene on Malvinas (violating all possible human rights of natives there and violating positive UN charters and sovereignty of Argentine), while that same Britain preventing Serbia to defend its own territory and sovereignty. Or think of USA, France and all their rights given to themselves to intervene all over the world killing all those people and violating UN charters.
To put it in context of this thread. Russia now coming in aid to Serbia and Poland have opportunity to join to Russia in one positive project that is- `Helping to Serbs to liberate their country`. That will for sure secure that Poland and Russia aren`t enemies. Plus, Poland would prove that isn`t enemy to Serbs, to Slavic cause, to positive UN charters that guaranties sovereignty of states.
BDW, Serbian sovereignty have support from Vatican, China, India, Brazil, many EU and even NATO states and most of the globe. So, reason more for Poland to join to Russia in that fantastic project `Helping to Serbs to liberate their country`.