Russia and China push back against U.S. warnings over military and economic forays in the melting Arctic

Washington — Russia and China on Tuesday pushed back against a U.S. warning over their increasing military and economic cooperation in the Arctic, where climate change is opening up greater competition.

Russia has in recent years beefed up its military presence in the Arctic by reopening and modernizing several bases and airfields abandoned since the end of the Soviet era, while China has poured money into polar exploration and research.

"We've seen growing cooperation between the PRC and Russia in the Arctic commercially, with the PRC being a major funder of Russian energy exploitation in the Arctic," Deputy Secretary of Defense Kathleen Hicks told journalists Monday, using an abbreviation for the People's Republic of China.