North Korea scrambled fighter jets on Thursday in response to a U.S. reconnaissance airplane that allegedly crossed the maritime Military Demarcation Line (MDL), according to North Korean media. 

The DPRK’s senior military leadership is now considering deploying warships with anti-aircraft missiles 280 miles (450 km) from Wonsan, the country’s main eastern port to prevent additional “unauthorized invasions of U.S. strategic reconnaissance planes,” the Korean Central News Agency (KCNA) reported Friday.

“This is a new development,” North Korea military expert and co-founder of the Oryx military blog Joost Oliemans told NK News, noting that “no North Korean navy ships are