Polish TV Apologizes For Showing Soviet Flag

IMHO Poles and Russians should stop the silly bickering and recognize each other as the two great Slavic powers.

Not quite true, Rick from Milan.
Poland was a Great power during UNIA and projected their influence in Central and Eastern Europe at the time.
Sometimes they were as stabborn Varaga as the Russian Varaga,
however they didn't went as far as Russians with genocide against neighboring countries, thought instigated by some catolic Papas.
The case you refering too was simply use an oportnity to support
a succsessor to the throne of Russia, later called by Russians
"False Dmitriy".
To protect him Pols brought about 2,000 knights, but later Russians rebelled against their Zcar, Dmitriy (similarly they started mutney against Peter the Great).
Pols left Moscow, but Russian Varanga saw it as a choice to invade Ukraine and Poland (as they saw a choice destroy again Georgia and repopulate it by Russians after death of Peter the Great that created Russia as Great Power with help of his Georgian grand-unkle, King of Georgia).
2,000 demoralized Pols were leaving Moscow followed by 70,000 Russian army that was afraid of strait combat, but was attacking
small groups of Pols and burning Moscow streets in their pass.
Only at border of Ukraine Russians attacked, but were loosing
to smaller Polish force.
About 150,000 Ukrainian Cossacks were provoked by Russians
save them from defeite, as they did - 220,000 defeited 2,000 Pols
and it was later used for expanding genocidal Russian empire...

Russian Empire killed young Pols in each generation, dragging them by hundreds of thousands on frozen roads of death to Siberian camps.
They never stopped - even lately they murdered the whole government of Poland - Russia wants again sado-mazahist Empire and spreading wings of Russian "sterviatnik"...