> Why is Russia so into hacking?

Same reason NK is. Same reason every country is. It is rather cheap in comparison. I mean even the largest super computers only cost a few hundred million. That's rather cheap when you consider other military adventures. One state of the art super computer is roughly the price of one (maybe 2) modern jets. The biggest cost is people. And you can do a ton of damage with hacking.

The costs are low, benefits are high.

[0] Summit was $350m, and a F22 costs $140m (per jet, not including development costs which is hundreds of billions)