The Arctic is fast emerging as the next strategic frontier for global dominance owing to its vast potential resources and increasing importance for global trade. 

Trump, when he was president, tried to buy Greenland but was turned down. He just left and gone to do other things. 

Biden, on the other hand, just unilaterally asserted control over a substantial portion of the Arctic Ocean, an area several times the size of California.  

Perhaps he had Learnt a few things or two from China's claiming almost the entire South China Sea.

But unlike the weak countries in South East Asia which fight back against China's claim, powerhouse like Canada just kept quiet.