As noted by @Schuldensuehner Ukraine's probability of default is now just shy of 97.1%:
Which is spectacular in its own right. But one has to consider what this market pricing really implies.
As we know, Ukraine will receive super-senior debt injections courtesy of the IMF. This will alleviate the immediate crunch on Government liquidity (Ukraine FX reserves are now below scheduled debt redemptions for March-September). So the above risk spike cannot be attributed to the risk of liquidity crisis.
As I explain here: http://trueeconomics.blogspot.ie/2015/02/18215-imf-package-for-ukraine-some.html , this liquidity support comes at a hefty cost: the debt burden that will result from the international lenders intervention will be non-sustainable and it can exacerbate popular discontent with current Government.
Now, the latest news from the Eastern ATO are pretty disastrous, and, arguably, also unlikely to go well with the Ukrainians.
This is of course speculative, but given lack of the risk around future liquidity crunch, the latest spike in the CDS spreads suggests that the markets see serious political risks ahead soon.