SEOUL, South Korea — South Korea and the United States will begin their annual joint military exercises next week with a focus on improving their combined capabilities to deter and defend against growing North Korean nuclear threats, the allies said Monday.

The drills could trigger a belligerent response from North Korea, which portrays them as invasion rehearsals and have used the allies' military cooperation as a pretext to advance the development of nuclear weapons and missile systems.

South Korean and US military officials said this year's Ulchi Freedom Shield exercise, scheduled for Aug. 19-29, will include computer-simulated exercises designed to enhance readiness against such threats as missiles, GPS jamming and cyberattacks, and concurrent field maneuvers and live-fire exercises.

The allies in particular aim to "further strengthen (their) capability and posture to deter and defend against weapons of mass destruction," military officials said in a joint news conference.

Lee Sung Joon, spokesperson of South Korea's Joint Chiefs of Staff, said about 19,000 South Korean troops will participate in the drills, which he described as an "essential element for maintaining a strong defense posture to protect the Republic of Korea," using South Korea's formal name.

Col. Ryan Donald, spokesperson of US Forces Korea, didn't comment on the number of US troops participating in the exercises and said he couldn't immediately confirm whether the drills will involve US strategic assets. The United States in recent months has increased its regional deployment of long-range bombers, submarines and aircraft carrier strike groups to train with South Korean and Japanese assets in a show of force against the North.

"This exercise will reflect realistic threats across all domains such as the Democratic People's Republic of Korea's missile threats and we will take in lessons learned from recent armed conflicts," Donald said, invoking the North's formal name.

Col. Ryan Donald, right, CFC/UNC/USFK Public Affairs Director, and Col. Lee Sung-jun of South Korea's JCS Public Affairs Director, attend a press briefing of the Ulchi Freedom Shield exercises at the Defense Ministry in Seoul, South Korea, Monday, Aug. 12, 2024. AP PHOTO

"ROK and US units will execute combined field training exercises across all domains. Field maneuver and live fire exercises will strengthen the alliance's interoperability while showcasing our combined capabilities and resolve," he said.

In addition to its military exercises with the United States, the South Korean military will support the country's civil defense and evacuation drills on Aug. 19-22, which will include programs based on North Korean nuclear attack scenarios, Lee said.

Animosity on the Korean Peninsula is high, as North Korean leader Kim Jong Un continues to use Russia's war on Ukraine as a window to accelerate weapons development while issuing verbal threats of nuclear conflict toward Washington and Seoul.

In response, South Korea, the United States and Japan have been expanding their combined military exercises and sharpening their nuclear deterrence strategies built around US strategic assets.

During last year's Ulchi Freedom Shield exercises, North Korea conducted ballistic missile tests that it described as simulating "scorched earth" nuclear strikes on South Korean targets.

The North in recent weeks has also flown thousands of balloons carrying trash toward the South in a bizarre psychological warfare campaign that has further deteriorated relations between the war-divided rivals.

Trash from at least one of those balloons fell on the South Korean presidential compound last month, raising worries about the vulnerability of key South Korean facilities. The balloon contained no dangerous material and no one was hurt.