North Korea accused South Korea of a “dangerous provocation” during a recent incident at the border of the two countries, adding to tensions as Pyongyang chafes at the annual joint US-South Korean military drills that are underway.

South Korea has confirmed it fired warning shots earlier in the week at North Korean soldiers who briefly crossed the heavily-fortified border between the two countries. North Korean state media called the shots a "deliberate provocation" and Pyongyang has accused Seoul of risking "uncontrollable" tensions.