Chinese military aircraft also entered South Korean airspace in the incident on Tuesday, officials said.
Three Russian military planes initially violated South Korea’s so-called aerial identification zone off its east coast on Tuesday morning, the South’s defence ministry said.
South Korean fighter jets were scrambled to the area to fire warning shots.
The Russian plane left the area but it returned and violated the airspace again, the ministry official said. He said the South Korean fighter jets fired warning shots again.
“The South Korean military took tactical action including dropping flares and firing a warning shot,” a defence ministry statement said.
It was the first time a Russian military plane violated South Korean airspace, according to South Korean officials.
The three Russian planes had violated the South Korean aerial identification zone with two Chinese military planes.
It was not known whether the two countries entered the air space deliberately.
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