South Korea had no military reconnaissance satellites of its own in space and has partially resorted to the United States' spy satellites to monitor moves by North Korea.
The South Korean announcement — which will likely infuriate North Korea — came hours after the North claimed to have placed a military reconnaissance satellite into orbit.
North Korea claimed to have successfully placed a spy satellite into orbit with its third launch attempt this year, demonstrating the nation's determination to build a space-based surveillance system.
Experts point to economic difficulties from prolonged international sanctions, but the closures may signal a possible change in North Korea's foreign policy that is more focused on Moscow and Beijing.
Travis King, who fled to North Korea before being returned home to the United States last month, has been detained by the U.S. military, two officials said Thursday.
At the recently concluded Games, South Korean athletes and journalists said North Koreans refused to engage with them. Some even avoided customary handshakes or photo sessions atop the podium.
Just 67 North Korean defectors arrived last year. Inter-Korean dialogue and exchange have ground to a halt. Seoul's Unification Ministry has a new, hawkish head who wants to change the agency's role.
In a summit in Russia, President Vladimir Putin and North Korean leader Kim Jong Un showed how geopolitical tensions have brought the two neighbors isolated by the West into closer alignment.
The leaders met at Russia's Vostochny Cosmodrome for a summit that underscores how their interests are aligning in the face of their countries' separate, intensifying confrontations with the U.S.
On Monday, a dark green train with yellow trim was spotted at the border where Russia, China and North Korea meet. It runs with one passenger in mind: the leader of North Korea, Kim Jong Un.
U.S. officials announced last week that the two leaders would meet in Vladivostok, as Russian President Putin seeks more arms to supply his war in Ukraine.
According to new U.S. intelligence, the potential agreement would allow North Korea to ship "significant quantities and multiple types" of weapons to Russia for deployment in Ukraine.
The failed launch prompted neighboring Japan to issue brief a "J-alert" ordering some residents to evacuate to safe places as the North Korean rocket flew over its southernmost islands of Okinawa.