South Ossetia and Abkhazia were peaceful when all of a sudden, Georgia attacked the inhabitants. Russian troops were already there, by the way.
The green light to attack was given by George W. Bush as part of Bush's neocon agenda of stirring up trouble worldwide. The Zionists of Israel were also deeply involved.
The Georgian military was commencing a slaughter of Russian speakers wanting to be independent.
After the US reneging on various treaties and understandings with the USSR and also Russia, Russia stepped in, which the US would have done had the shoe been on the other foot.
So, why has Poland complained? Religion to start with. Poland has historically been Roman Catholic. Russia has been Orthodox. It goes deeper than that, but that's a good starting place.
What should Poland do? It should knock it off and stop trying to make out as if Russia is some sort of demon waiting to devour Europe. Russia has always been first and foremost a defensive nation. It's empire has resulted from others attacking it and Russia expanding to create buffer zones, as there are not the natural barriers afforded many other nations, such as the US with oceans on both sides and compliant neighbors that would be easily crushed if not so.
If any nation is suspect in this, it's Poland. What's Poland really up to? Is it trying to merely protect itself, or does it have grander designs of its own? It's a fair question.
The Polish leadership isn't doing the Polish People any favor by thumping Russia in the chest right when Russia is being so insanely attacked by insane US and UK neocons.