An international scramble for the Arctic’s oil and gas resources accelerated on Friday when Canada responded to Russia’s recent sovereignty claims with a plan to build two military bases in the region.

On a trip to the far north, the Prime Minister, Stephen Harper, said: “Canada’s new government understands that the first principle of Arctic sovereignty is: use it or lose it. Today’s announcements tell the world that Canada has a real, growing, long-term presence in the Arctic”.

An army training centre for 100 troops is to be built in Resolute Bay, and a deep-water port will be built on Baffin Island, to bolster Canada’s claim to ownership. The move comes a week after a Russian sub planted a flag on the Arctic seabed. Moscow claims rights to half the Arctic. The US, Norway and Denmark also have claims.

A US state department official, speaking last week, signalled that Washington will not stand by in the face of what it sees as a Russian land-grab, though America’s position is complicated by its failure so far to sign the treaty of the seas. As Canada was making its move, Danish scientists were preparing to head for the Arctic on Sunday as part of their bid for a share of the region’s wealth. A US coast guard icebreaker was heading to the Arctic to map the seafloor north of Alaska.

Although the US and Canada enjoy good relations, the American ambassador to Canada, David Wilkins, has expressed annoyance with the prime minister’s claims in the past. No country owns the Arctic Ocean and north pole, but there are international laws governing its use. Under one UN convention, each country with a coast has sole exploitation rights in a limited “exclusive economic zone”, beyond which mineral resources are controlled by the International Seabed Authority. However, upon ratification of the UN convention, each country was given a 10-year period within which to make claims to extend its zone. Norway (ratified in 1996), Russia (1997), Canada (2003), and Denmark (2004) have all launched claims that certain Arctic sectors should belong to their territories.