South Korean F-15 fighter jets, sent to intercept a Russian surveillance plane, fired 360 machine-gun rounds to prevent it from entering the airspace over the disputed Dokdo/Takeshima islands, occupied by South Korea but claimed by Japan. Russia denied violating the airspace, saying two of its bombers carried out a planned drill with China over ‘neutral waters’, and denied any warning shots were fired by South Korean jets. Russian and Chinese bombers and reconnaissance planes have occasionally entered the zone in recent years, but now Japan has confirmed that its military has also deployed fighter jets in response to the Russian incursion. Because it claims sovereignty over the islands, Japan's government said that Russia had violated its airspace. It also said that South Korea's response was extremely regrettable.