The European Commission said Friday it was fining Elon Musk’s social media app X with the equivalent of $140 million, saying that it had breached the bloc’s digital rulebook — a move that will likely ...

The European Union on Friday fined Elon Musk’s X 120 million euros ($140 million) for violating its digital regulations, a move that drew an angry backlash from Washington.

“The only substantial meaningful fines that have been imposed so far have been against American companies,” Andrew Puzder, the US ambassador to the EU, told Bloomberg Television’s Francine Lacqua in a...