Nothing dates faster than the future, but here's my prediction:
AY will continue to fly over Russian airspace Finland has lived next door to Russia for a long time and long since learned how to make that relationship work. They will not be looking introduce sanctions and will not ban Russian airlines from their airspace.
Russia will not intentionally attack foreign flights. They will not try to force planes to land. This would be a one shot game.
Russia will not fall into war - the war will stay in Ukrainian territory. Flying over Russia will be perfectly safe.
Planes fly over war zones and undesirable nations all the time. Afghanistan, for example, has been at war for most of the past 40+ years and planes have continued to fly across it. Planes fly directly from South Africa to Europe over a whole host of war zones, dictatorships and strange places.
Let's sit back now and see how it pans out. Full disclosure: my OWA includes HEL-NRT in October.