North Korea analysts are watching for signs that Kim Jong-un is set to unveil new weapons or test-fire a submarine-launched missile in the coming weeks. 

Formations of troops have been practising for what is expected to be a major military parade in on October 10, the 75th anniversary of the ruling Workers' Party.

Some observers say North Korea may use the Pyongyang parade to showcase its largest missiles for the first time since 2018.