not to forget about cultural/historical differences between poland and ukraine as regards their attitude to russia - whareas in Poland, Russia is viewed even today as a possible threat, there are parts of Ukraine where inhabitants are ethnic Russians or, at least, speak Russian as their first language, mainly in eastern parts of the country...
Polish politicians make sure that the anti-Russian attitude prevails among the local population, for their own necessity. The same can be said about Western Ukraine.
Around 50% of the Ukrainians speak Russian as a home language, while the remaining use Ukrainian. But several of those who use Russian as their primary language are anti-Russian as well.
I think the only possible solution is to split Ukraine in to two. The Central and Western regions should stay as Ukraine, while the pro-Russian east, with some 1/3rd of the population should merge with Russia.
The provinces which should merge with Russia should be the ones where PoR+Communist Party got majority in 2012 (in Blue):
Odessa - 60.06%
Mykolayiv - 59.60%
Dneipropetrovsk - 55.17%
Kherson - 52.68%
Crimea - 71.75%
Sevastopol - 76.36%
Kharkiv - 61.82%
Luhansk - 82.20%
Donetsk - 83.94%
Zaporizhye - 62.11%
PoR votes:Communist Party votes:Result by Constituency: (Blue for PoR, Orange for KPU)