The United States flew a surveillance aircraft over South Korea's capital areas on Tuesday, an aviation tracker said, amid simmering tensions over possible provocations by North Korea.
An RC-135W Rivet Joint of the US Air Force was spotted in the skies above areas near the western port city of Incheon following similar operations by the aircraft the previous day, Aircraft Spots tweeted.
Global Hawk (US Air Force)
Several other surveillance aircraft, such as the EP-3E and the RC-135S, have also been detected here often in recent weeks, and they apparently have carried out operations monitoring North Korea.
The latest flight was made on the eve of North Korean leader Kim Jong-un's birthday, which some experts and foreign media see as a potentially significant date for provocative acts by the regime.
Last week, Pyongyang warned of a "new strategic weapon" in the near future and a "shocking actual action" in protest over the stalled denuclearization talks with the US.
Experts say the North's "strategic weapon" may mean an intercontinental ballistic missile capable of carrying multiple warheads or a submarine-launched ballistic missile. (Yonhap)