"New North Korea Weapons Test Threatens Trump's Diplomatic Achievement" by Choe Sang-Hun and Motoko Rich for The New York Times

Melissa Hanham commented to The New York Times on the potential routine testing operations.

The short-range weapons tested on Saturday were "more about repelling an invasion than starting a war", said Melissa Hanham, a North Korean weapons expert at Open Nuclear Network, a programme of One Earth Future. "Probably what is happening is some kind of testing of a unit to make sure that everyone is prepped and ready, and it is probably somewhat routine."