Poland expresses regret after rioters attack Russian Embassy in Warsaw . In posts on Twitter , Russia 's Ministry of Foreign Affairs said the Kremlin had summoned the Polish ambassador over the riots and given him a protest note saying the Vienna convention had been violated , after the Russian Embassy in Warsaw `` had been blocked for hours . '' The Polish Foreign Ministry said it was "shocked and deeply concerned" by the incident. Russian media say protesters threw fireworks at Polish Embassy in apparent retaliation . Poland declared independence on November 11 , 1918 , at the end of World War I .
Poland expresses regret after rioters attack Russian Embassy in Warsaw . The Polish Foreign Ministry said it was "shocked and deeply concerned" by the incident. Russian media say protesters threw fireworks at Polish Embassy in apparent retaliation . Poland declared independence on November 11 , 1918 , at the end of World War I .