The other day I was just staring at the front of my Copy of Rust In Peace, and noticed, the two guys sitting to Vic's left are Mikhail Gorbachev and George H.W. Bush, but I have no idea who the other three guys in the hangar are.
You are indeed correct about the two gentlemen at Vic Rattlehead's left being Gorbachev and Bush. And to answer your question, to the right of Mr. Rattlehead in the Hangar, we have Richard von Weizsäcker, Toshiki Kaifu and John Major. Dr. von Weizsäcker was the president of Germany during the timeframe when Rust in Peace was released in 1990. Likewise, Toshiki Kaifu was Prime Minister of Japan at the time, albeit for only a very short-lived time. And John Major was Prime Minister of the UK and leader of the British conservative party. Collectively, these five world leaders represent the five so-called "Superpowers" of the world during the early 1990s.