The letter to UNCITRAL seeks to partly annul a 2009 agreement regarding management rights; the Croatian side asserts MOL’s “unlawfully” obtaining of management rights in a snafu that ended up with the then-Croatian prime minister jailed on charges of bribery.

On Saturday, MOL representatives stated that no notification about the filing with UNCITRAL had been received by them.

In November, MOL filed a request for arbitration with the International Centre for Settlement of Investment Disputes (ICSID) concerning the negotiations.