The US used an F-22 to send a message to North Korea. But how much stronger can the messages get?
The US carried out another simulated bomb run with a supersonic B-1B bomber on Wednesday, but this time it included the US's top-of-the-line air superiority fighter, the F-22, according to Yonhap.
B-1 flights represent the US's go-to response for North Korean provocations, such as missile tests, and the bomber flights draw a strong, sometimes dangerously escalating response from Pyongyang.
But North Korea has a problem there. It apparently can't track the B-1 in flight because of its outdated radar and air-defense systems, according to NK News.
The F-22 is the world's stealthiest aircraft, meaning it's extremely unlikely North Korea could see it coming.
The combined B-1 and F-22 drill represents a step up in the normal tit-for-tat between the US and North Korea. It also comes during the Vigilant Ace aerial exercise that China and Russia warned the US about.
"Through the exercise, the South Korean and US air forces have demonstrated the alliance's strong will and capability for strong retaliation against North Korea's nuclear and missile threats," South Korea's Joint Chiefs of Staff said, according to Yonhap.
But with the US using its best planes to message North Korea, and Pyongyang demonstrating missiles that experts assess can hit anywhere in the US, it's unclear just how much higher tensions on the Korean Peninsula could escalate.