Reuters:

U.S. Defense Secretary Mark Esper said on Monday North Korea would likely carry out unspecified tests if they “don’t feel satisfied,” amid fears the two countries could return to the collision course they had been on before launching diplomacy.

Tension has been rising in recent weeks as Pyongyang has conducted a series of weapons tests and waged a war of words with U.S. President Donald Trump.

“We have seen talk of tests. I think that they will be likely if they don’t feel satisfied,” Esper told reporters traveling with him from Europe back to Washington.

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