I think if there had been a nuclear exchange, we'd know.

Most experts say they believe the risk of a nuclear exchange is very low.

"We thought a mufti-nation nuclear exchange would be a nice start."

And a major nuclear exchange could be over in less than a day.

I'm afraid we're going to have a nuclear exchange in the next four weeks.

The implication of this is that an accident could lead to a full nuclear exchange.

Their mission is to stop the war before both countries resort to a nuclear exchange.

The novel opens in 1997, two years after the nuclear exchange.

Korea would have been very different if America was not concerned about nuclear exchanges.

"is Norway really worth the risk of a nuclear exchange?"