Learning Russian could be useful in certain geographical areas near Russia, in the military, or translator position. It’s also possible that when hostilities end (or escalate) more position openings could occur. But to learn for personal life the use will be limited.

I don’t personally see how learning a language could be offensive, it’s knowledge not a lifestyle or way of supporting current hostilities. The hate people have is mainly towards the Russian government and policies, anyone who extends that to a language likely also have a lot of other issues they lump together and are being small minded.

The only person who can determine the need to learn the language is yourself. I doubt the world will be overrun by Russian speaking soldiers any time soon, Mandarin is more likely in that kind of a situation.