Hello, are'nt all those games besides Supreme Ruler: Cold War about the Cold War gone hot. World in Conflict is about military operations between Sovjet and US troops. A game about Cold War should be about politcal and covert operational struggle, not about military operations. So basically a game focussed on economics, cultur, diplomatics and espionage. Not really the field of most strategy games.

There are some blitzkrieg mods, total conversions for the cold war time period. Like Cuban Missile Crisis.

Codename: Panzer: Cold War. A sequel to the Codename: Panzer series. RTS.

Hearts of Iron: Armageddon. A strategy game about the post world war 2 time.

There is The People General, a panzer general sequel, set in an alternate 1960 to 1970, where a conflict between China, Sovjet Union and the US has broken out.

Diplomatic games that come to my mind are Diplomacy 2 for modern time period and Victoria 2 for the 19th century,

Civilization 4, you could achieve diplomatic, cultural or science victory without war.

Covert Action is an old Sid Meier game about Espionage.

Have a nice day