Hi Vladimir,
I went to my local bpost (Belgian Post) office and the lady at the counter told me all transport to Russia is currently stopped. Letters are simply collected, but not transfered.
From your experience it seems that other European countries still have normal postal service with Russia, but I can only rely on what is told by bpost...
Below the message on the website of bpost:
bpost still handles shipments to Ukraine and neighboring countries. Commercial shipments to Russia and Belarus are suspended.
The current situation in Ukraine makes it difficult to transport and distribute shipments to Ukraine and Moldova. Therefore serious delays should be expected for both countries.
bpost management has decided to stop all express and commercial shipments to Russia and Belarus until further notice. bpost will continue to accept letters, Economy & Standard parcels to Russia and Belarus. However, delays in transport and additional customs control will cause delays.