The thing is that Russia dumping all its treasury bills isnt going to cause a panic on treasury bills --- people will buy them right up, the problem is when there is a crisis in confidence, when people believe there will be a default, that things will get worse, that the bonds they bought will be worthless or worth less then now, but if Russia sells their assets, it wont trigger a crisis.
The example you bring up, is not at all the same. The banking crisis was when all of a sudden banks realized they had way more worthless assets then they thought, for some of them it threatened their solvency. I dont think you can say it made any currency worthless -- all that money is still worth about the same. A few banks needing bailout money, and a drop in economic production, a short recession, none of these are the crisis' you seem to be describing, like an entire monetary system collapse/destruction of the entire banking system of the US. Almost every bank is still around it seems.