Russia are a breach to ICAO rules,
Thanks Bidule, I must admit this is well outside my area of expertise, and I do not doubt what you say, just a remark, ICAO SARPS are aiming to standardize international operations But you are still sovereign in your airspace. The only thing you have to do as a State is to file a difference with ICAO. Plenty of those, the US having the biggest chunk. You can also withdraw from ICAO and do what you want ( e.g North Korea) but stuck in your own airspace, and fly outside with bilateral agreements. As someone said in the other thread, Putin is at war and ,and in war times ,everything is possible.
The hangover will be hard though....