Heh, a few weeks back I was listening a podcast and it mentioned when US/NATO decide to remove some foreign country's government they start by calling it regime instead of ruler/ruling party etc.
This isn’t just about the US/NATO e.g. Iran not wanting to recognize Israel so they refer to it as the Zoinist Regime, the term regime is used to refer to an illegitimate and often authoritarian government, however for the most part when NATO uses that term they are objectively correct even if they have additional motives for using it.