not that you are going to see this but I imagine a couple things here, besides what is listed in the article.
1. "if you owe the bank 100,000 you have a problem, you owe the bank 1,000,000 the bank has a problem." Ukraine is much closer to 1,000,000 than Greece was/is.
2. I don't think Ukraine has restructured its debt before, as where Greece had punted before and was having to deal with it a second plus time
3. Ukraine's government wasn't elected under the sole purpose of running up more debt like Greece was. and the unrest was started by the outsing of the people who actually started the debt issue. so on a certain level it speaks to them wanting to go a different direction.
4. Ukraine is under going a civil war at best and an invasion at worse, similar restructuring has happened in other countries based on those facts
5. Beyond number 4 Ukraine also lost a very sizable chunk of land, and one would assume income, when Crimea was illegally seized. and that has been recognized the world over sans Russia
6. going back to #2, Ukraine has a better chance of paying it back if they can get peace than Greece does/did, imo. and it seems the banks feel the same way.
7. One way or the other, joining Russian economic groups or the EU, Ukraine has a bit of an "untapped" economic growth front, that Greece lacked, again if they can get peace.
not that you are seeing this, but figured I might as well respond in case anyone was legitimately wondering.