AFAIK, current plans are to develop vehicle which can be launched both from Baikonur and Kouru. Baikonur has a variety of heavy launch pads - Zenit, Proton and a new launch pad for Angara family funded by Kazakhs.<br /><br />On the other end, Kouru has only one launch pad for heavy LV - Ariane one. I doubt Europeans would build pad for Zenit or fund development of Onega since these LVs will eventually compete with Ariane on commercial launch market. So, more likely Kliper'll ride Ariane from Kouru.<br /><br />As for Zenit, it's more political than technical problem. There're political tensions between countries, so Russians would better cooperate with Europeans or Kazakhs than with Ukrainians.<br /><br />Onega stays in papers, while Angara is being funded by the military, even some pieces of hardware were built. IMHO, Angara-3 has all the chances to become Kliper LV.