Yanukovych was in prison several times including in his yough for petty crime. There is a story among prisoners that birds of prey represent law and justice. This is also a story that Yanukovych was extremely superstitious, especially after some Hutsul shaman predicted his death several years ago. So some people are saying that the crucified birds were Yanukovych’s attempt to exorcise that curse.
Edit: A much less fun possibility is that this is a normal procedure for drying game.