Because the Soviet Union 2.0 has a power that 1.0 never had...to cause the people of Europe to freeze.
Never heard of them.
The rest of the world and the ICAO did not respond with a ban on American civil aviation on the international airways after shooting down Iran Air 655, although it was proven beyond reasonable doubt that Iran Air 655 was shor down by USS Vincennes
In the same vein, the rest of the world and the ICAO did not respond with a ban on Ukrainian civil aviation on the international airways after Ukraine shot down Air Siberia 1812 in 2001.
I wonder, on what grounds you would ban Russian civil aviation after an Ukrainian military pilot (most likely LTC Dmitro Yakatsuts), flying Ukraine military jet shot down civilian airliner?