Thanks Yoav, Butelczynski, MrConk and elliott for your interest and comments.
Regarding your question Butelczynski, I have found this aircraft profile in two Russian sources (have a scan)
In the last scan it is mentioned (if I understand correctly) that this aircraft was on the Mongolian border. So, the model profile is OK, and also your remark on yellow nosed aircraft.
Shalom Mor