South Korea says its jets fired warning shots at a Russian surveillance plane that entered its airspace on Tuesday.
Officials said the plane twice violated the airspace over the Dokdo/Takeshima islands, which are occupied by Seoul but also claimed by Japan.
South Korea’s Ministry of Defence said it scrambled fighter jets in response and fired 360 machine-gun rounds.
Russia has denied violating the country’s airspace.
Moscow said two of its bombers carried out a planned drill over “neutral waters” and denied any warning shots were fired by South Korean jets.
This is the first incident of its kind between Russia and South Korea.