Games like Ukraine Defender
Games like Ukraine Defender include Europa Universalis IV, Victoria 3, Crusader Kings II, Europa Universalis V, and Heroes' Vow: Three Kingdoms. We matched them by the tags players give Ukraine Defender on Steam (Simulation, Flight, Political Sim, Wargame, and Strategy): closest matches first, and among equally close ones the better-known games.

Europa Universalis IV
Shared: Simulation · Strategy · Grand Strategy

Victoria 3
Shared: Simulation · Strategy · Political Sim

Crusader Kings II
Shared: Strategy · Simulation · Political Sim

Europa Universalis V
Shared: Simulation · Strategy · Grand Strategy

Heroes' Vow: Three Kingdoms
Shared: Simulation · Strategy · Wargame

Age of History II
Shared: Strategy · Political Sim · Simulation

Ultimate Epic Battle Simulator 2
Shared: Simulation · Strategy · Wargame

Nuclear Option
Shared: Simulation · Flight · Wargame

Imperator: Rome
Shared: Simulation · Strategy · Political Sim

War Thunder
Shared: Simulation · Flight · Tanks

Plague Inc: Evolved
Shared: Simulation · Strategy · Outbreak Sim

Victoria II
Shared: Political Sim · Strategy · Simulation

Total War: WARHAMMER
Shared: Simulation · Strategy · Grand Strategy

Democracy 4
Shared: Political Sim · Simulation · Strategy

Bomber Crew
Shared: Simulation · Flight · Strategy

SuperPower 3
Shared: Simulation · Strategy · Political Sim

Crusader Kings III
Shared: Simulation · Strategy · Grand Strategy

Beholder
Shared: Political Sim · Strategy · Simulation

Totally Accurate Battle Simulator
Shared: Simulation · Strategy · Indie

60 Seconds! Reatomized
Shared: Strategy · Dark Humor · Simulation

Besiege
Shared: Simulation · Destruction · Flight

ROMANCE OF THE THREE KINGDOMS XIV
Shared: Wargame · Immersive Sim · Grand Strategy

Ages of Conflict: World War Simulator
Shared: Simulation · Political Sim · Wargame

Gunner, HEAT, PC!
Shared: Simulation · Tanks · Immersive Sim