Washington • President Donald Trump says that North Korea “had best not make any more threats to the United States” or “they will be met with fire and fury like the world has never seen.”

Trump issued the warning during a briefing on opioid addiction at his golf course in Bedminster, New Jersey.

A Japanese defense paper and a U.S. media report said Tuesday that North Korea may have successfully produced a miniaturized nuclear warhead that can fit inside its missiles.

That’s a key benchmark in the country’s attempt to become a full-fledged nuclear power.

After many years of failure,countries are coming together to finally address the dangers posed by North Korea. We must be tough & decisive! — Donald J. Trump (@realDonaldTrump) August 8, 2017

Washington’s alarm over North Korean leader Kim Jong Un’s pursuit of a nuclear capability has intensified in the past month after the North conducted two tests of intercontinental ballistic missiles last month.

The Washington Post is reporting that U.S. intelligence officials assess that North Korea has successfully produced a miniaturized nuclear warhead that can fit inside its missiles.

That would mean North Korea has passed a crucial threshold on the path to becoming a full-fledged nuclear power.

The Post story, citing unnamed U.S. intelligence officials, said the confidential analysis was completed last month by the U.S. Defense Intelligence Agency.

Officials at the agency would not comment Tuesday. The Office of the Director of National Intelligence could not immediately be reached for comment.