Canada’s prime minister announced plans Friday for an army training center and a deepwater port on the third day of an Arctic trip meant to assert sovereignty over a region with potentially vast energy resources. But Denmark was staking its own claim with a scientific expedition. The race to secure subsurface rights to the Arctic seabed heated up when Russia sent two small submarines to plant a tiny national flag under the North Pole last week. The United States and Norway also have competing claims in the vast Arctic region, where a U.S. study suggests as much as 25 percent of the world’s undiscovered oil and gas could be hidden. Full Story