SEOUL, Feb. 6 (Yonhap) -- News reports about China have effectively vanished from North Korean media, raising speculation that Pyongyang is upset with its close ally over its request the North not go through with its expected nuclear test, an analysis of the country's major wire service, daily paper and broadcasters showed Wednesday.

The screening of the Korean Central News Agency (KCNA), Rodong Sinmun, Korean Central Television (KCTV), Radio Pyongyang and Chosun Central TV by Yonhap News Agency following the passage of the U.N. Security Council resolution on Jan. 23 (Korea time) showed almost no mention of China in the North's tightly-controlled mass media.