The tallest buildings in Europe are in Russia.

An excerpt from the article 22 facts about Europe

The leader is Lakhta Centr with a height of 462.5 meters - located in Saint Petersburg. The next four tallest skyscrapers are located in Moscow: Federation: East Tower, OKO: South Tower, Neva Tower 2, and Mercury City Tower. In 6th place is the Varso Tower in Warsaw, 310 meters high. Varso Tower is the tallest skyscraper in the European Union.