Personally, I don't think there Ukraine situation is a very good reason not to travel. If we stop our normal lives then it's a victory for Putin and his mafia gang. The war could drag on for many years. Russia is effectively bankrupt and running low on munitions, most of which should be in museums!
Not being well is a pretty good reason. Having been fairly ill in September I know that if you are ill you will very much wish to be home, however kind the village people are.
Surgical masks - which are what most people wear - are more or less useless against Omicron. But ffp2/3 masks are, and a good choice for the vulnerable in crowded places. Planes are pretty safe when the aircon is on. A recent analysis of data from a thirteen-hour flight showed that a heavily-infected man with no mask constantly coughing infected three people next to him. But on the ground before take-off and after landing a good mask makes sense.