Putting a bunch of hungry people from different countries together, in a room, is risky. Except when they are arms dealers. "Russian arms dealers" are as comfortable in Moscow as in Washington or Tel Aviv or Delhi or Beirut. They know the rules, and they know the price for breaking them (i.e., they get publicity aka 'govt attention' and lose their international lifestyle). Obviously there are other 'transnational' interests besides weapons merchants, and collectively they decide Monday what politicians are going to do Tuesday. The smart reptiles work for government. But the smarter ones (good and bad) don't. The circular problem that you refer to, of financial interests (e.g. arms dealers) causing misery in poor countries, by using politicians, is endless.
from the article: World powers urge Iran to accept standing nuclear offer