N. Korea's early disclosure of Hwasong-20 ICBM apparently aimed at putting pressure on US

This photo, published by the Korean Central News Agency, shows North Korean leader Kim Jong-un, right, overseeing a test of a high-thrust solid-fuel missile engine using composite carbon fiber material the previous day, Sept 9. Yonhap

North Korea appears to have disclosed a new intercontinental ballistic missile (ICBM) under development earlier than scheduled in a bid to exert pressure on the United States, Seoul's military officials said Thursday.

Earlier this month, North Korean leader Kim Jong-un visited a research lab that developed a new high-thrust solid-fuel engine, saying it will be used for the next-generation Hwasong-20 ICBM under development.

The North also conducted a ground test for the engine, disclosing what appears to be the warhead of the Hwasong-20.

A Seoul military official said the North's new ICBM appears to be in the early stage of development.

"Pyongyang appears to have disclosed it somewhat hastily in consideration of political factors," the official said, noting that the move could be aimed at putting pressure on the U.S.

North Korea seems to be aiming to show off its solidarity with China and Russia and raise tensions in Northeast Asia with a new ICBM as it exceptionally disclosed its warhead and related engine test, according to Rep. Yu Yong-weon of the main opposition People Power Party.

Experts said North Korea may display the Hwasong-20 during a military parade marking the 80th founding anniversary of the ruling Workers' Party of Korea on Oct. 10 or test-fire it around the anniversary.