TikTok was fined $600 million on Friday for improperly transferring European users’ personal data to China, marking a flashpoint in the West’s effort to split the app from its Beijing-connected owners.

TikTok disputes the claim it hasn't adequately protected people's personal data, and has said it plans to appeal.

The fine specifically comes from the Irish Data Protection Commission, which found in an investigation that TikTok did not protect European user data and that the Chinese government could have potentially accessed the data from the 27 countries in the European Union.