World Domination is free unofficial expansion that uses Yuri's Revenge Engine. The setting of war takes in 2020 after the Ukraine Crisis that led the escalation into a full blown World War 3 that ensued for 30 years. Featuring 16 playable countries, ton of units, campaign and new features that Ares Team has to offer.
Why "Katyuska"? The correct name is "Katyusha".
En.wikipedia.org
Or have you just created your own launcher with different name? ;)
Typo XD - will be corrected in beta release.