Best place to look would be on HF frequencies:
North Central Asia - 3019.0 - 5646.0 - 13315.0 - 17958.0
Europe A - 3479.0 - 5661.0 - 6598.0 - 10084.0 - 13288.0 - 17961.0
None of these are covered with feeds right now, but I have received polar route flights over the Siberian Sea and Magadan at night from time to time, so I'll try dialing in some of these tonight (between 9PM and midnight EDT, 01-04Z) on the 6577/5550 feed.