Washington and Pyongyang have recently been exchanging sharp statements. In July, Pyongyang conducted two ballistic missile tests which provoked a sharp response from the United States, Japan and South Korea.
Clapper explained that America must be "pragmatic" about the fact that North Korea will not give up its nuclear capabilities and engage diplomatically.
North Korea has lashed back at the US following President Donald Trump's latest warnings. "I was really taken aback by the level of the siege mentality and the paranoia that exists there", Clapper said of his 2014 visit to North Korea. "They will be met with fire and fury like the world has never seen", Trump said.
China Central Television on Saturday cited Xi as saying that Beijing and Washington are both interested in the denuclearization of the peninsula.
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Prime Minister Shinzo Abe says he will do everything he can to protect the Japanese people as tensions escalate over North Korean plans to send missiles flying over Japan toward Guam.
"I hope people learn from history and don't repeat that".
On Friday, the Defense Ministry said it was deploying four of Japan's surface-to-air Patriot interceptors in western Japan to respond to a possible risk of fragments falling from missiles.
"I think this was aimed primarily at China to let China know how serious we are about this; to get China to re-engage, not just to play games the way they've been doing since the meeting at Mar-a-Lago", he said on MSNBC's "Morning Joe".
The battle of words between President Donald Trump and North Korean leader Kim Jong Un is similar to the run-up to World War I, according to James Clapper, former director of National Intelligence.