we've seen this before, in world history.
you had the great game for control of india. you had the scramble for african resources.
the arctic is the next piece of the earth that is going to be up for grabs, and, in this case, trump is right: the great powers are going to be vying for control of greenland any day now, so coming in and buying it out makes some sense, if it keeps everybody else out.
i'm not sure the russians would be so polite as to ask.