Ukraine is facing a very fast, mobile, highly equipped and trained army. While Russia has not gone any further than Donbas at this particular time, who knows what's going to happen?
The cyber-attacks are getting more and more intense, and that's for one or two reasons. They're either trying to ensure they have it right the first time, or they're just seeing what happens, what the response is. The responses from the west, and NATO in particular, have been negligible at this time and this has emboldened them to do more and more. Consequently, until some type of peacekeeping force is put into place, Ukraine is going to be in constant fear of there being a total invasion or an annexation again, as happened in Crimea.