Well, no experience into Petro as we dropped it in favor of Kabarovsk.
We did study up on Petro however and a 12000 feet mountain on down wind comes to mind.
Nasty place if I remember right.
Kabo was more userfriendly, long rwy, fairly flat, and friendly airport staff.
They give ya a briefing with clearance etc inside some big wooden building.
Can be some confusion going in there as to what procedure etc to use.
Have not flown that route in years. Pretty quiet on the Russian airways at night, we were the only plane in the sky for hours and hours.
Sorry, not much help. Good luck.
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Men, this is no drill...