The problems is revolutions are people-based. No matter how many decades you keep American tanks in various middle eastern countries, if the people don't want to change, they won't.
Consider if China makes a better offer for the country than the US State Dept, which seems likely based on historical performance of the US State Dept. After the USA blows up all their old tanks, cementing anti-US hatred for generations, they can buy nice new Chinese ones after the treaty with China is signed.
Consider if China makes a better offer for the country than the US State Dept, which seems likely based on historical performance of the US State Dept. After the USA blows up all their old tanks, cementing anti-US hatred for generations, they can buy nice new Chinese ones after the treaty with China is signed.