Liberty relied on bretonia on its economics, now that bretonia is smashed thats not good for liberty.
Kusari does not supply liberty to compensate their losses with bretonia, and Kusari might just one day actually turn against liberty, for two reasons - 1, rheinland will force them to, 2, gallia will force them. Rheinland holds kusari responsible for the munich disaster and kusari relies much on rheinland as it relies on gallia. The bond with these houses is not about trust but mutual intrest.
