Then your exit ports would be Baltimore or Norfolk. Norfolk is easier for exporting of a used car as US customs will clear it faster.

Citizen of where? Most countries of Europe allow you to move there (citizen or not) and declare two cars per household exempt of VAT & duty, provided you have owned them for at least six months before your arrival date. Frequently there is an exemption not to sell in the first 6 to 12 months after you arrive.

For the CIS and individual countries, unknown.

Do a full fluid change before you go and snow tires as well. If you can pre-equip the car with a speedometer in km/hr and reset the displays to C termp, as well as setting the heat unit for Euro frequencies - do it. If you have Sirius, it's useless so sell it off. Some countries in the EU will require the rear fog light(s), unknown for the CIS.

If you end up paying duty & VAT to get the car in, would you save any money?

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2002 Euro X5 (E53) 3.0 diesel (M57)
5 speed manual with UUC short shifter.
Pre-xDrive NV125 transfer case (chain & gears).
Factory Xenon headlights, Spyder LED tail lights
Updated vortex crankcase breather.
Motorsport dead pedal, factory fire extinguisher, factory first aid kit, factory F&R mud flaps, factory PDC

Bilstein B6 shocks F&R
Redline oil has replaced "lifetime" fluids (F&R diff, manual transmission, transfer case and P/S).
Dimple magnetic drain plugs in all compartments.