There's a lot of nuance here, because there isn't really a (current) clear-cut case of the US bombing a sovereign nation where the government has not given the US permission. Of the current active campaigns:
- Afghanistan
- Iraq
- Pakistan
Each of these countries has a functioning government, even mostly democratically elected, and all US military involvement is with the permission of the host -- if Pakistan told the US to stop using their airbases, it would happen.
- Syria
There's less explicit permission here, but the US is bombing a current enemy of the Syrian federal government, so there's no real complaining.
- Somalia
- Yemen
- Libya
It's completely ambiguous which government you consider to be the sovereign one (arguably, there really isn't one). Either way, at least the publicly backed government is OK with US airstrikes.