EU Takes Legal Action Against U.K. For Not Naming New Commissioner

The UK has decided not to nominate a candidate for the EU Commission due to its upcoming general election, citing domestic pre-election guidance. The EU Commission has issued a formal notice to the UK for breaching EU Treaty obligations, stating that domestic laws cannot justify non-compliance with Union law. The new EU Commission, led by Ursula von der Leyen, cannot take office until all member states have representatives. The UK's Brexit delay has postponed the EU Commission's formation, and the UK faces potential fines if the issue reaches the European Court of Justice.

What action did the EU Commission take against the UK for breaching its obligations?

What is the consequence for the UK if the case goes to the European Court of Justice?