[Exclusive] US tells NIS, "Do not attend Korea-US-Japan meetings"... via official document

It has been identified that the United States delivered a written position to exclude the South Korean National Intelligence Service (NIS) from the trilateral working-level meeting held in Washington this past June. It is highly unusual for the U.S. to refuse the participation of an allied intelligence agency in a meeting and to deliver such a message in written form rather than verbally. As allegations regarding the NIS's involvement in the so-called "Coupang crackdown" surfaced in the U.S. at the time, some interpret this measure as a reflection of American dissatisfaction.
The "Intelligence is National Power" monument in front of the NIS headquarters, which was restored last July. Yonhap News
According to multiple authoritative sources on the 8th, ahead of the "5th Trilateral Working Group Meeting of Diplomatic Authorities of Korea, the U.S., and Japan on Responding to North Korean Cyber Threats" held in Washington D.C. on June 25–26, the U.S. notified the South Korean side of its position to exclude the NIS from attending. The notification was reportedly delivered in both verbal and written forms.
Approximately 60 people attended the meeting, including diplomatic authorities from the three countries and officials in charge of North Korean nuclear and cyber sectors from relevant ministries. This is why observers suggest that specifically excluding the NIS, which plays a key role in responding to North Korean cyber threats such as hacking, carries more significance than a simple adjustment of meeting attendees.
https://n.news.naver.com/article/025/0003556788?sid=100