As far as "sin" is concerned, on Eltsin's part there was a lot of it. Actually in Russia he was regarded as a sort of a drunken clown. You know about the situation in Ireland when he couldn't get out of the plane. But when in Russia such episodes happenned frequently. Once he succeded to fall from a bridge into a river while drinking at his country house. His body guards didn't have time to do anything as he fell over railings. The river was rather steep and his guards thought he had broken his neck. But nothing happenned. He walked out from the river and went on drinking. Sometimes he imagined he was a sort of Herbert von Karayan and took the place of a conductor of an orchestra. Of course it's all very funny, but it's not a kind of a president you should be proud of. I quess you'll agree.
The guy who really changed the world was Michael Gorbachov. Eltsin simply happenned to be in the right place at the right time when there was a plot of communists against Gorby. Had Eltsin been a real gentleman he should have returned power to Gorby. But he wasn't one.
And as far as the Russian approach to politics is concerned, the majority of people regard politicians - both Russian and foreign - as guys who are playing their own games without special attention to the interests of their own nations. "It's just business, nothing personal." - any politician can say.

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To my mind the ultimate solution of many problems, especially regarding terrorism, would've been admission of Russia to the NATO and WTO. In this case this anti missile stuff could be constructed in Moscow suburbs and nobody would give a damn.