Google accused European Union antitrust watchdogs of blundering their way through a probe that culminated in a record €4.3 billion ($4.5 billion) fine for allegedly abusing the market power of its Android mobile-phone ecosystem.

Google is squaring off against regulators from the European Commissions today in the EU Court of Justice in Luxembourg.

Google has appealed to the Court of Justice of the European Union (CJEU), against a record €4.3 billion ($4.5 billion) antitrust fine imposed seven years ago. It urged the court to scrap the penalty, arguing that the fine unfairly targets its innovative practices.