To clarify runway length confusion:
Smolensk has two airfields, Smolensk North and Smolensk South. Both have similarly aligned (08/26) 50m wide runways. The North one is the military airfield with 2470m runway, the south one is a small civilian/utility airfield with 1550m runway. The accident must have happened at the North one. On Google Earth I cannot discern any approach lighting system in place, even though the resolution is very good.