Fly into Moscow fairly frequently.
They use metres instead of feet so if your PFD doesn't have a metres/feet button, get a converter handy.
Standard QNH is used down to FL1500m. Below that it's QFE. Double and triple check that against your chart altitudes.
UUDD's fairly reasonable but expect 90deg intercepts onto the ILS. (Definitely the case for UUWW)
If you're lucky you'll actually get an arrival clearance. However, they usually expect you to do what you filed. Like wise for your departure. Be very careful with the QFE/QNH Flight Levels.
When they want you to use 1013Hpa/Mba they'll use the word "standard". When they want you to use QFE, they'll use the word "height".
Don't rush when in their airspace, better to be slow and get it right than the other.
