An ilClan state, centered on Terra, with a two jump (60LY) buffer around earth, would directly boarder the Clan Protectorate... if not directly bordering the planet Marik.
It looks like the 3rd League is occupying most of Prefecture X by the end of 3151. It also looks like the FWL is abandoning the Augustine Alliance when they pulled 6th Free Worlds Guards (Shrapnel 8) to focus on the Empire closer to Atreus. Assuming that CapCon get's thrown back or pulls back, there wouldn't be much to stop the ilClan from completing the expansion in what used to be prefecture VII (the FWL slice). With Nicole invading the Empire at New Olympia in mid 3152 and at least part of the Clan Protectorate (Beta Strike Cluster, some Spirit Cats) on the losing side of that Battle, the time to make a decision is fast approaching... if it hasn't already been made by Petr Kalasa, and he's just forgotten to tell his partners.