It looks weird to say the least but the FT has published may be a week ago now an explanation, to make it short, following a reassessment of how GDP is accounted for several countries but more noticeably the Nederland and the UK have seen on their contribution revised. The amount called represents the difference between what should have been the contribution and what actually the contribution was once GDP includes the non for profit sector according to that paper.
It lead me to joke about it but I have had a very confidential success when I said that I suspected the Eurozone leaders to try to seduce the Kremlin with a typical Soviet era policy  of reward failures with bailouts and penalize success with fines hoping that at least it would make Peskov laugh....
Don't know if it did.