Why are ice class restrictions imposed on ships in ice regions, such as the Baltic?

Minimum ice class restrictions for ships are set so as to ensure smooth winter navigation and the safety of navigation in ice. Assistance of vessels with inadequate engine power or ice strengthening would be difficult and time- consuming for icebreakers, and would disrupt navigation by other traffic. Also, it would not be safe to expose such ships to ice loads and ice pressure.

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A ship is bound for Finnish ports in the northern Bay of Bothnia during the winter. What is a typical ice class restriction?

A ship is bound for Baltic ports in wintertime. What special requirements will she have to meet relating to local ice conditions?