South Korea says it fired warning shots after Russian military planes entered its airspace.
Fighter jets were also scrambled in response.
According to the Defence Ministry in Seoul, it's the first time an aircraft from Moscow has violated the country's territorial sky.
It is planning to summon officials from the Russian Embassy to register formal protests.
Trump tells Ukraine's Zelenskiy to stop hitting Russian diesel
US President Donald Trump on Sunday called on Ukrainian President Volodymyr Zelenskiy to stop targeting Russian diesel infrastructure, saying the attacks were causing a shortage of the fuel that is "hurting the world".
Rescuers search for 130 people after Indonesia passenger ship sinks; six dead
Indonesian rescuers were searching on Sunday for 130 people from a passenger ship that sank in the Java Sea after 113 others were evacuated, the country's search and rescue agency said, adding that six people had died.
Russia hits passenger train on Ukraine's border with Poland, just misses 'diplomatic train'
A Russian drone hit a passenger train on Ukraine's border with NATO member Poland on Sunday, shortly after former British Prime Minister Boris Johnson and other European diplomats had used the same line.
Russian drone attack injures five in Ukraine's Odesa, officials say
At least five people were wounded in a Russian attack on the Ukrainian city of Odesa on Sunday morning, officials said, a day after strikes on the city killed two people.
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