Suville came up with the original plans to attack CE before Carelia I believe. The deal was that Suville would get Wayburg once Carelia had Skalk and Nida for an X amount of time if I recall correctly. Then sunddenly before any real gains were made they demanded Wayburg and CE supported them in that claim.
Biggest fault was to work with Suville in Carelia's case, but that's hindsight. If Suville had kept fighting we'd be talking differently now...