 The Biden administration says the U.S. will enter into an agreement with Canada and Finland to build a fleet of polar icebreaker ships. As NPR's Jackie Northam reports, the agreement is part of a broader effort to deter Russian and Chinese aggression in the Arctic. The U.S. Coast Guard for years has pleaded without luck for more icebreakers. At the moment, the U.S. has only two that are well past their sell-by date.