In 1925, based upon the Sector Principle, Canada became the first country to extend its maritime boundaries northward to the North Pole, at least on paper, between 60°W and 141°W longitude, a claim that is not universally recognized (there are of ocean between the Pole and Canada's northernmost land point). On April 15 the following year, the Presidium of the Supreme Soviet of the USSR declared the territory between two lines (32°04′35″E to 168°49′30″W) drawn from west of Murmansk to the North Pole and from the eastern Chukchi Peninsula to the North Pole to be Soviet territory. Norway (5°E to 35°E) made similar sector claims, as did the United States (170°W to 141°W), but that sector contained only a few islands, so the claim was not pressed. Denmark's sovereignty over all of Greenland was recognized by the United States in 1916 and by an international court in 1933. Denmark could also conceivably claim an Arctic sector (60°W to 10°W).