threaten to reveal his vast love affairs with gay asian businessmen

: I'm going to go public with your love affair with Takeshi Kitano if you invade my country

: That's not going to work, this is a matter of national security.

: Damn!
Sue him for war rape

: I will sue you if you invade my country!

: Does your country have a court system?

: Yeah, and I find you guilty of being an starfish!

: Nice try, but you're out of your jurisdiction.

: Damn!
also buy new shoes

: I'm going to buy new shoes if you invade my country.

: No you won't, you'll be dead.
Say that you were just kidding, which will fool him. Secretly build up an army so you can take over the United States.

: I was just kidding, lay off dude.

: Well if it was just a joke, I guess I can call off the invasion for now.
It worked, and now you have a new quest for your day off: Amass an army and take over USA. How do you begin your campaign?