South Korea says its jets have fired warning shots at a Russian military surveillance plane that entered its airspace on Tuesday.
Officials said the plane twice violated the airspace over the Dokdo/Takeshima islands.
The islands are occupied by South Korea and are 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.