Threat of boycotting the European Cups (i.e. the CL) by the Italian clubs: they attacked publicly both FIVB and CEV (and partly also the Italian federation) regarding playing schedules and slots in the CL. There are too many collisions of competitions regarding dates and too few berths for Italian teams - the last is as obvious as the first, considering their quality. Not explicitly mentioned were "leagues with better European cups ranking without being better" (meant are obviously Germany, but also Switzerland and the now giving up Azeri) and the fact, that no Italian team could get a free slot in CL (not even qualification), while the champions of Romania, Czech Republic and Serbia got fixed places in the groupphase.
Altogether, if negotiations with the mentioned federations doesn't result in acceptable changes for them, they would boycott next European Cups season 2018/2019.
Considering the importance of Italy in this sports, I'm sure, there will be negotiations, because this country is too important for both CEV and FIVB.