The U.S., Russia, and China are all moving military and economic weight into the Arctic, and the buildup is raising the risk of a direct clash between nuclear powers.

• A new U.S.–Denmark–Greenland agreement lets America expand bases in Greenland, including part of the planned Golden Dome missile defense, and blocks non-NATO countries from building installations there.
• U.S. and Canadian forces have been rehearsing Arctic combat in Alaska with F-35s and rocket systems, in a region where American and Russian territory sit just a few miles apart.
• Melting sea ice is opening new shipping routes that bypass the Suez Canal, which is why China wants a role in what it calls its polar silk road.
• The prize underneath is huge: a large share of the world's undiscovered oil and gas, plus the rare earths and platinum metals that defense and AI hardware depend on.
• Russia has spent two decades building nuclear-powered icebreakers while America let its fleet rot; new U.S. ships are ordered but years away.

Outlook: Expect more NATO exercises, base expansion, and sharper warnings from Moscow as the Arctic becomes a permanent front rather than an afterthought.