Jane Fonda has written her autobiography

Fonda said the incident - which earned her the nickname "Hanoi Jane" - was a "betrayal" of the US military.

But she said she did not regret going to the country being photographed with American prisoners-of-war (PoWs).

Fonda made the comments in an interview with CBS television show 60 Minutes, to be aired in the US on Sunday.

Radio broadcast

The actress caused an outcry in the US when she visited a North Vietnamese anti-aircraft gun site which was used to shoot down American pilots.

Fonda told interviewer Lesley Stahl it was the "largest lapse of judgment that I can even imagine".

Fonda said she regretted her visit to a Vietnamese anti-aircraft site

She said: "The image of Jane Fonda, Barbarella, Henry Fonda's daughter ... sitting on an enemy aircraft gun was a betrayal."

But Fonda did say she did not regret meeting American POWs in North Vietnam or making broadcasts on Radio Hanoi.

"There are hundreds of American delegations that had met with the POWs.

"Both sides were using the POWs for propaganda. ... It's not something that I will apologize for."

Fonda is appearing on 60 Minutes to promote her upcoming autobiography Jane Fonda: My Life So Far.