Finnish Virtual Pilots Association's IL-2 Great Battles server is open. Server is visible in the MP menu with a name: "Finnish VirtualPilots - Dynamic War". Basic idea (tl;dr version):
1) Shoot / bomb enemy defensive lines, bridges, depots and ships on each sector and shoot down enemy aircraft.
2) Fly in paratroopers to help in the fight
3) When mission ends, the amount on of damage caused, planes/tanks lost and paratroopers dropped on both sides determines the amount of land area the