Well, in this case, it isn't about ethics between rivals in an electoral campaign. It's a throat-ripping fight to gain control over a significally strategic piece of land, in which people in high places can make lot of money and power. A lot.
Now, the established, corrupt puppet government (See Mexico's 70 year rule of the PRI party for an example of such a thing) doesn't want to lose all the money, power and privileges. To illustrate the situation, as I pointed out in another thread already, the *only* mobile-phone company in Ukraine is owned by Kuczma's wife, and it charges two euros for every call's minute. Not to mention the refineries, mines and so on.
So, what does the goverment do to avoid losing its position? Fuck up the only possible rival. It's as simple as that.