The Lear guys I have spoken with go thru Nome, AK, then down to Petropavlovsk to Japan or China. But Nome to Petro is 1300 nm, so you will have another stop in Siberia. I have overnighted in Petro--no fun. Magaden is also a possibility.
You will need Russian visas, a ground handler at each location and watch the weather--alternates are few and far between. LR40s do it with many stops.
GF