[RusIvan]

Simply because the Russian leadership was never tried and is still in power, ++++

USSR debts was done by Soviet leadership not Russian leadership.

[demosthenes the elder]

I'm all for dropping debts to the USA that the USSR ran up... but, somehow, I am doubtful we loaned our cold-war enemies all that much. I could be wrong, so feel free to enlighten me if you know better.
On the other hand, we have loaned a buttload of relief money to RUSSIA...