That would be nice.
But then you get another outside government to come and annex them.

search for China annexes Nepal - https://www.bbc.com/news/world-asia-60288007

I didn’t read this particular article. It just came from a search and my words are from memory.
This is only for convenience in case you are being lazy to search.

Ideally you^[problem being, there is no “you” that will manage that] have to manage the 2 parameters:

• profitability for anyone trying to annex the country
  • Your military power needs to scale with GDP and exploitable geographical resources to protect from outside threats
  • But the more money/power the government gets, the greater the internal threat (corruption mostly)
• QoL of citizens