SEOUL, South Korea (AP) — South Korean air force jets fired 360 rounds of warning shots after a Russian military plane briefly violated South Korea’s airspace twice today, Seoul officials said, in the first such incident between the countries.

Three Russian military planes — two Tu-95 bombers and one A-50 airborne early warning and control aircraft — initially entered South Korea’s air defense identification zone off its east coast before the A-50 intruded in South Korean airspace, the South’s Defense Ministry said.

South Korean fighter jets then scrambled to the area, including F-16s, and fired 10 flares and 80 rounds from machine guns as warning shots, a ministry official said, requesting anonymity due to department rules.

The Russian reconnaissance aircraft left the area three minutes later, but it returned and violated the South Korean airspace again for four additional minutes later Tuesday, the ministry official said. He said the South Korean fighter jets fired 10 flares and 280 rounds from machine guns as warning shots again.

It was the first time a foreign military plane has violated South Korean airspace since the end of the 1950-53 Korean War, according to South Korean officials.

The former Soviet Union supported North Korea and provided the country with weapons during the Korean War, which killed millions. In 1983, a Soviet air force fighter jet fired an air-to-air missile at a South Korean passenger plane that strayed into Soviet territory, killing 269 people.Relations between Seoul and Moscow gradually improved.