"They tell us the person who made the statements doesn't know much about foreign policy or nuclear policy or the Korean Peninsula or the world generally," Obama told reporters yesterday at the conclusion of nuclear security summit here.

He said Trump's recent statements on US foreign policy, that has unnerved the national security establishment, came up during his interaction with world leaders.

"Even in those countries that are used to a carnival atmosphere in their own politics, want sobriety and clarity when it comes to US elections," Obama said.

Earlier, Trump had favoured countries like Japan and South Korea developing their own nuclear weapons capabilities to defend themselves rather than the US protecting them.

Obama said it has prevented the possibilities of a nuclear escalation in conflict between countries that in the past and throughout history have been engaged in hugely destructive conflicts and controversies.

He called foreign policies with countries like Japan and South Korea an investment that rests on the sacrifices that American men and women made back in World War II. "We don't want somebody in the Oval Office who doesn't recognize how important that it is," Obama said.

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