It's never a bad idea to learn another language.
It's never a bad idea to learn. period...full stop.
The act of learning anything wires our brains in a thousand different ways; increases our critical thinking skills. Increases our verbosity and our ability to communicate our own ideas more effectively. It increases problem solving skills, etc...
The very act of learning is something that should be practiced every day with something, whether that's a new language, or a hobby, or being a history buff...it doesn't matter. What matters is the learning itself.
So if Russian is what is giving you that interest right now, do it. At the very least, chicks dig polyglots.
Who'd have thought that an Archaeology dad-joke would be the thing to make me snort-laugh today.
Well done. And thanks.