Whoa…

What’s happened: North Korea claims it’s successfully tested a hydrogen bomb for its intercontinental ballistic missile. This is the country’s sixth test of a nuclear weapon and the first since US President Trump came to office.

What do we know about it: Initial data suggests this is the most powerful weapon the country has ever tested. It caused a 6.3-magnitude tremor in the country’s northeast.

What’s the reaction been: US President Donald Trump said North Korea’s actions were “hostile and dangerous.” South Korea said it will seek to “completely isolate” North Korea, while China urged Pyongyang to “stop taking wrong actions.” Russia said the test “deserves the strongest condemnation.”

If true, this is a significant next step on their progression.