There are currently lots of speculations about negotiations and possible diplomatic solution to military conflict in Donbas. I am however very skeptical about the success. Of course I am not diplomat, so hereafter is purely my personal opinion.
Croatia has gained independence only recently, nevertheless during Middle ages it was independent state and even after losing independence, it retained certain degree of autonomy up to the First world war. This means that through the most of its history Croatian nobility existed and Croatian soldiers had chance to fight for its homeland, not merely for the foreign ruler.