My flight from Europe to Japan with stop-over in Finland (Helsinki) was cancelled as it went through Russian air space, and no alternative was given.
As far as I know most other flights from London/Paris/Frankfurt also usually fly the northern route through Russian air space.
I am now looking for a different route, southbound, for example with stop-over in Bangkok, or Singapore or United Arab Emirates, or other, doesn't really matter.
How do I best approach such a search that avoids Russian air space?