SEOUL, South Korea — North Korea on Friday threatened unspecified stern steps against the United States and South Korea ahead of their upcoming military drills, which Pyongyang called a war rehearsal that would be more provocative than last year.

The warning is typical of the harsh rhetoric that North Korea often deploys ahead of major U.S.-South Korean military exercises and suggests the country could conduct more missile tests in coming days. Experts say North Korea has often used its rivals’ drills as a pretext to ramp up its testing activities to expand its weapons arsenals and promote public support for leader Kim Jong Un.

The U.S. and South Korean militaries are to start their major summertime Ulchi Freedom Shield exercises Monday and have described their scope as similar to past years. The allies have said the 11-day exercises are meant to strengthen their readiness against North Korean threats and reiterated that they are defensive in nature.

In a statement carried by state media Friday, North Korea’s Foreign Ministry called the U.S.-South Korean training “a rehearsal for an aggressive war” that is triggering a different level of instability in the region.

“It is our consistent principle of ensuring security to respond to a new level of a threat with a new level of a deterrent,” the statement said. North Korea “will more clearly express its stance on the enemies to cope with any threats and challenges through the responsible and decisive exercise of the right to legitimate self-defense.”

North Korea also said the drills would be of a “more serious provocative nature and dangerousness than last year” and involve all the military assets and war-fighting modes of the U.S. and South Korea, a claim that those countries haven’t said.

A U.S. military statement issued Friday said U.S. and South Korean forces will practice joint operations in complex scenarios, including a live-fire exercise to test joint precision targeting and maneuver, a wet gap crossing, and distribution of prepositioned military equipment.

North Korea’s neighbors detected two ballistic missile launches off the North’s east coast in the past week. North Korea hasn’t commented on the launches, but outside experts assess they were likely meant to protest the U.S.-South Korean drills or upgrade its weapons systems.

Kim has ignored the U.S. and South Korea’s offers to resume diplomacy and focused on taking steps to bolster his nuclear arsenal since his diplomacy with U.S. President Donald Trump broke down in 2019. Experts say Kim will likely eventually aim to use his advancing nuclear program to win greater U.S. concessions such as extensive sanctions relief.

North Korea has expanded cooperation with Russia in recent years by supplying troops and ammunition to support its war against Ukraine in return for economic and military assistance. North Korea has also recently pushed to deepen ties with China, its biggest trading partner.