"...included a plan for a 99-year lease..." The loss of sovereignty is the most extreme example for of course. Leasing is something in between. Though 99 years

"...included a plan for a 99-year lease..." The loss of sovereignty is the most extreme example for of course. Leasing is something in between. Though 99 years is a pretty long time. "You can't pay, ok how about we'll just take control of this little part of your country for 99 years".