US vice president Kamala Harris arrived in South Korea a day after the North fired two short range ballistic missiles off its east coast.
The launch, which breaches UN sanctions, comes as the US and South Korea hold joint naval drills in the waters around the Korean peninsula.
South Korea and Japan officials have condemned the “provocations”.
BBC reports that It’s the second launch this week and part of a record year of tests by Pyongyang.
And the timing is crucial – during her visit to South Korea, Ms Harris will travel to the border and the heavily fortified Demilitarised Zone (DMZ) which separates the North and South.
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