Kim Jong Un, the leader of North Korea, has ordered his armed forces to be prepared to fight back against any “provocation” by the enemy, according to state media on Friday. Pyongyang has also promised to place bigger and more powerful weapons along its border with South Korea.

After the North launched a spy satellite last month, tensions on the Korean peninsula have grown. Seoul suspended a crucial provision of a 2018 inter-Korean military agreement, and Pyongyang responded by declaring it was no longer obligated by the agreement.

Visiting North Korea’s air force command on Thursday to the branch’s airmen day, Kim rolled out guidelines to improve the military’s combat posture and increase “its capabilities to fight a war to the full,” news agency KCNA reported.

“He set forth operational and tactical policies … so as to counter any military provocation and threat of the enemy immediately and powerfully,” KCNA said.

That stop was followed by a visit to a fighter wing, where pilots staged a demonstration flight, it said.

Photographs released by state media showed Kim and his daughter, both dressed in long leather jackets, watching the show.

Kim praised the air force for being “fully prepared to perfectly carry out their air combat missions under any unfavourable situation,” KCNA said.

The United States and its allies have strongly condemned the North’s first spy satellite launch as a violation of multiple United Nations Security Council resolutions. But Pyongyang has said it would launch more satellites, calling it an exercise of a right to self-defence.

On Thursday, the United States targeted North Korea with fresh sanctions over the satellite launch, designating foreign-based agents it accused of facilitating sanctions evasion. South Korea also announced sanctions on 11 North Koreans.

Reflecting the rising strain, South Korea has suspended tours of the Demilitarised Zone (DMZ) between the two Koreas, a Seoul official said.

Local media reported that North Korean soldiers at the Joint Security Area (JSA) inside the DMZ had started carrying firearms again after the North withdrew from the inter-Korean military deal.

The DMZ tours had restarted last week; they had been halted after a U.S. soldier’s unauthorised crossing into North Korea while on a tour in July. Private Travis King was later handed back by the North and returned to the United States, where he faces charges.