Seoul, South Korea (CNN) North Korea launched two unidentified projectiles from South Pyongan Province toward the East Sea, also known as the Sea of Japan, on Tuesday morning, South Korea's Joint Chiefs of Staff (JCS) said in a statement.

The JCS said they received warnings of the twin launches at 6:53 am and 7:12 am Korean time. They are believed to have flown a maximum of 330 kilometers (205 miles).

"Our military is observing the situation and maintaining readiness," the JCS sad. A senior US administration official said the US is monitoring the situation and consulting with allies. Japan's Defense Ministry said in a statement that its territory was not threatened.

The launches happened just hours after a top North Korean diplomat working on nuclear negotiations with the United States said Pyongyang would be open to resuming talks with Washington.

The envoy, Choe Son Hui, said in a first-person statement published Monday by North Korean state media that North Korea is willing "to sit with the US side for comprehensive discussions of the issues we have so far taken up at the time and place to be agreed late in September."

Read More