North Korea's sinking of a South Korean warship may herald a "dangerous new period", the nominee to be US director of national intelligence has warned.

He said the sinking of the South Korean corvette Cheonan in March, which a South Korean-led inquiry found was the result of a North Korean torpedo attack, and unsuccessful attempts to assassinate a senior North Korean defector reminded him of the bombing of Korean Airlines Flight 858 in 1987.

"The most important lesson for all of us in the intelligence community from this year's provocations by Pyongyang is to realise that we may be entering a dangerous new period when North Korea will once again attempt to advance its internal and external political goals through direct attacks on our allies in the Republic of Korea."

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