If their 20th century military performance is anything to go by, there's not a lot to worry about.
They used to lose 10 men to every American they killed in Korea, but that was nothing compared to how many of their own men starved to death due to incompetence. They couldn't win the Sino-Vietnamese war either. They have no history of military successes.
There's no god damn way they want to go toe-to-toe with Uncle Sam.