Arktika-class icebreaker
The "Arktika" class is a Russian (former Soviet) class of nuclear-powered icebreakers. Formerly known as "Project 10520 nuclear-powered icebreaker", they were the largest and most powerful icebreakers until the 2016 launch of the ship named Arktika. Ships of the "Arktika" class are owned by the federal government, but were operated by the Murmansk Shipping Company (MSCO) until 2008, when they were transferred to the fully government-owned operator Atomflot. Of the ten civilian nuclear-powered vessels built by Russia (and the Soviet Union), six have been of this type. They are used for escorting merchant ships in the Arctic Ocean north of Siberia as well as for scientific and recreational expeditions to the Arctic.
Jääkarhu
Although sometimes called the largest and most powerful icebreaker in the world by the press in the 1920s, "Jääkarhu" was no match for the Soviet polar icebreakers "Yermak" and "Svyatogor" that had nearly twice the displacement and over twice the power of the Finnish icebreaker. However, as a Baltic escort icebreaker she was considered better than the giants and was often compared with the Soviet icebreaker "Lenin", which was roughly of the same size and was considered a very successful design.