MOSCOW, September 24 (RIA Novosti) - Russia protested on Thursday a decision by the Polish parliament to condemn the Soviet "invasion" of Poland in 1939.

The lower house of Poland's parliament adopted on Wednesday a resolution condemning the entry of Soviet troops into Eastern Poland in September 1939 as "an act of aggression."

The Russian Foreign Ministry said the resolution "seriously harms the development of normal bilateral relations."

"We can only regret that Poland's supreme legislature, touching upon quite a sensitive issue concerning the sentiments of both Polish and Russian citizens, as well as Ukrainians and Belarusians, does so with a biased and politicized approach," the Russian Foreign Ministry said in a statement.

The Polish resolution refers to Soviet troops' entry into western parts of what are now Ukraine and Belarus, and at the time had been under Polish control since the end of the 1919-1921 Polish-Soviet War.

The Soviet Union said the deployment of troops was meant to protect Ukrainians and Belarusians, as the Polish government had fled the country in the face of the German attack and could no longer guarantee the security of its own citizens.

Last week, Russia's NATO envoy, Dmitry Rogozin, accused the Polish leadership of Russophobic sentiments in its views on the outbreak of the Second World War.

"The Polish version is a lie and the attitude of the Polish leadership is provocative," he said.