NATO Sec.-Gen. Jens Stoltenberg said North Korea had provided "an enormous amount of ammunition" to Russia while both China and Iran were supporting Moscow militarily in its war against Ukraine.
His state visit comes amid US accusations that North Korea has supplied "dozens of ballistic missiles and over 11,000 containers of munitions to Russia" for use in Ukraine.
Russia has said that world powers need a new approach to North Korea, accusing the United States and its allies of seeking to "strangle" the reclusive state.
The North's balloons were "gifts of sincerity" for South Koreans who "cry for freedom of expression," North Korea said.
In addition to providing North Korea with an opportunity to test missiles, Russia has taken steps that will make it harder for the United Nations to monitor sanctions imposed on Pyongyang in 2006.
IDF strikes launchers in Gaza humanitarian area • Jewish French woman allegedly raped, kidnapped to 'avenge Palestine' • IDF Rafah op. appears imminent
North Korea and Iran have long been suspected of cooperating on ballistic missile programs, possibly exchanging technical expertise and components that went into their manufacture.
A weekly selection of opinions and analyses from the Arab media around the world.
It flew about 600 km (372 miles) before falling into sea, South Korea said, while Japan's defense ministry estimated it covered a distance of 650 km (400 miles).
Russia vetoed the annual renewal of a panel of experts monitoring enforcement of longstanding United Nations sanctions against North Korea over its nuclear weapons and ballistic missile programs.