Rudy Giuliani thinks Donald Trump is doing a brilliant job keeping North Korea guessing.

Rudy landed at LAX Tuesday when our photog asked if we should strike North Korea first or wait until they engage in overt aggression against us or an ally.

The former NYC Mayor clearly thinks if this were a poker game, Donald Trump knows when to hold 'em and when to fold 'em.

Funny side note ... Rudy confuses Ronald Reagan for Trump, but he has a good explanation.