A North Korean delegation led by the cabinet minister for international trade is visiting Iran, the North’s state-run media reported on Wednesday, amid suspicion Tehran used North Korean weapons technology for its attack on Israel.

The minister for external economic relations, Yun Jong Ho, left Pyongyang on Tuesday by air leading a ministry delegation to Iran, the Korean Central News Agency said, without providing further details. 

Yun, who previously worked on ties with Syria, has been active in North Korea’s increasing exchanges with Russia, this month leading a delegation on a visit to Moscow, KCNA added. 

The North’s announcement comes after some experts raised the possibility that North Korean parts or military technology could have been used by Iran against Israel, following the launch of more than 300 drones and missiles on April 13. The experts cited close military cooperation between Pyongyang and Tehran.

South Korea’s spy agency, the National Intelligence Service, said last Wednesday it was looking into whether the North’s weapons technology was used in the ballistic missiles that Iran launched against Israel. 

“We are keeping tabs on whether the North Korean technology was included in Iran’s ballistic missiles launched against Israel, given the North and Iran’s missile cooperation in the past,” the NIS said.

Separately, Matthew Miller, a U.S. State Department spokesperson, said last Tuesday that the United States was “incredibly concerned” about long-suspected military cooperation between North Korea and Iran.

Having established diplomatic ties in 1973, North Korea and Iran have long been suspected of cooperating on ballistic missile programs, possibly exchanging technical expertise and components for their manufacture.

A 2019 report by the U.S. Defense Intelligence Agency showed Iran’s Shahab-3 ballistic missiles were developed based on North Korea’s midrange Rodong missiles. 

The Khorramshahr missile that Iran has developed is also believed to be technically linked to North Korea’s Musudan missiles.

North Korea has also been suspected of involvement in arms trade with Russia, although the two countries have denied that transfers have taken place.

The NIS has said that since August, North Korea has made 10 weapons transfers of an estimated one million shells to Russia, according to the NIS, which is widely seen as an attempt by North Korea to boost its sagging economy amid aftermath of COVID-19 and international sanctions. 

Other reports have suggested North Korea has delivered ballistic missiles to Russia’s military, citing U.S. satellite images.

Edited by Mike Firn.