1) We don't own the islands, so it's hard to give them away. Wrangel Island has a Russian village on it and has been continuously controlled by the Russians/Soviets for over a hundred years.
2) None of these islands were included in the purchase of Alaska from Russia.
3) The islands aren't "in Alaska" they are all very far on the Russian side of the Bering Strait, and all but 1 are in fact North of Siberia.