Tautology or argument agreement?
I'm not sure what you mean. I was answering in terms of enforcing the non-compete clause internationally. It would mean Rennie has breached his obligations under the contract so they can just stop paying him and he has no comeback against that.
In terms of the non-compete clause I guess theoretically RA could continue to uphold his contract by paying him and attempt to force him not to take a competing role elsewhere until the contract expires. I'm not entirely sure what that would look like.
I would assume that the contract allows Rennie to resign and end the contract with some notice period (like every employment contract) and I would think that would void the contract and allow Rennie to work elsewhere.
Non-compete clauses are notoriously hard to enforce even when the competing relates to poaching clients of your former employer. In this sort of situation I'd say it is impossible to prevent someone whose contract has ended (because they terminated it) from taking a job elsewhere.