"This decision is sacrilegious, cynical and absolutely immoral. [Polish authorities] are violating international agreements with Russia, according to which Poland made a commitment to preserve historic monuments. This agreement is valid, it hasn't been terminated by anyone," Matvienko said.
The parliament speaker stated that the "provocative" actions of Polish authorities would not remain without consequence, adding that the Russian Foreign Ministry was currently formulating an appropriate response.
On Tuesday, the Russian Foreign Ministry strongly condemned Poland's actions. Moscow also drew attention to the fact that the Soviet Union had made a decisive contribution to the defeat of fascism in Europe, and that over 600,000 Soviet soldiers died during the liberation of Poland.
According to the 1992 Russian-Polish Agreement on Friendly and Neighborly Cooperation, Warsaw must protect and preserve Soviet and Russian cemeteries, graves, monuments and other memorial sites located in the country.