Worst: We won't develop a cloaking device if you promise not to attack us.
Romulan response: Try to provoke the Federation into a war that makes them look like the good guy.
Real world response: Romulus surrounds Earth with a thousand warships before they even know the war has started.
True. The Federation Cardassian peace treaty also felt like a huge diplomatic failure, comparable to the Munich Pact. The Cardassians treated that treaty like toilet paper, violated it whenever they wanted to and then used it against the Federation whenever they could. The Cardassians and Federation were at war with each other a few years after the peace treaty was signed.