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

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.

A record EU antitrust fine of 4.3-billion-euro ($4.5 billion) imposed on Google seven years ago punished the tech giant over its innovation, the Alphabet unit told Europe's top court on Tuesday, as it asked judges to scrap the EU decision.