South, North Korea say they've exchanged warning shots near disputed sea boundary

Both North and South Koreaexchanged warning shots near their disputed western sea boundaryon Monday, their militaries said, amid heightened tensions over North Korea's recent barrage of weapons tests.

South Korea's Joint Chiefs of Staff said in a statement that its navy fired warning shots to repel a North Korean merchant ship that it says violated the sea boundary early Monday.

North Korea's military said itresponded by firing 10 rounds of artillery shells as a warning to South Korea.It accused a South Korean navy ship of intruding into North Korean waterson the pretext of cracking down on an unidentified ship.

South Korea's Joint Chiefs of Staff said the North Korean artillery launches breached a 2018 inter-Korean accord on reducing military animosities and undermines stability on the Korean Peninsula. It said the North Korean shells didn't land in South Korean waters.

The poorly marked sea boundary off the Korean Peninsula's west coast is a source of long-running animosities between the Koreas. It's a scene of several bloody inter-Korean naval skirmishes and violence in recent years, includingtwo attacks in 2010 that killed 50 South Koreans.

Joint U.S.-South Korean military drills

In recent weeks, North Korea has carried out a string of weapons tests in response to what it calls provocative military drills between South Korea and the United States. Since Sept. 25, North Korea has fired 15 missiles and hundreds of artillery shells toward the sea.

The missile launches were largely designed to protest U.S.-South Korean drillsnear the Korean Peninsula that involved aU.S. aircraft carrier for the first time in five years. North Korea said its artillery firing drills were staged as counter-measures against similar South Korean artillery drills at border areas.

Seoul and Washington routinely conduct military drills to maintain their readiness against potential North Korean aggressions. The allies say their drills are defensive in nature, but North Korea views them as an invasion rehearsal.

South Korea'smilitary is performing annual field exercises, set to end this Friday. This year's drills involve an unspecified number of U.S. troops.

WATCH |Mlanie Joly calls for peace during DMZ visit:

Mlanie Joly travels to Koreas demilitarized zone, calls for peace

2 years ago

Duration 2:03

Canada's Foreign Affairs Minister Mlanie Joly made a special visit to the demilitarized zone that separates the two Koreas as a gesture of diplomacy as tensions continue to grow in the region. North Korea has been testing missiles for weeks, putting the region on edge.

Next week, South Korea and the United States are to hold joint air force drills involving some 240 warplanes, including F-35 fighters operated by both nations. The drills are aimed at inspecting the two countries' joint operation capabilities and improvingcombat readiness, the South Korean military said Tuesday.

Some experts say North Korea's recent weapons tests suggest its leader Kim Jong-un has no intentions of resuming stalled nuclear diplomacy with Washington anytime soon as he would want to focus on further modernizing his nuclear arsenal to boost his leverage in future negotiations with the United States.