Do you really think the US and Eu will go to all the trouble to put in a government they like in Ukraine, and then let that government default? Or fail so badly that there is another uprising (which might happen if they default).

No they will make sure that there is no default, but other than that, Ukraine's economy will be awful.

Austerity in Ukraine will be apalling - at least in Greece they had many good years before the crisis hit, but when did Ukraine have good years?

My heart really goes out to old people there - there is nothing they can do - they live on like 100 USD a month and they are good people, fellow Europeans. They haven't been lazy and they are not guilty of the situation. It's a disgrace and very tragic.