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.
Putin and Modi discuss trade, peace in New Delhi summit
Russian President Vladimir Putin and Indian Prime Minister Narendra Modi began summit talks in New Delhi on Friday, as New Delhi rolled out the red carpet for the Russian leader.
Indian air travel crippled as IndiGo's pilot crisis enters fourth day
Air travel across India was in turmoil for a fourth day after IndiGo cancelled around 500 flights on Friday, including all from the capital New Delhi, after failing to plan for new pilot flying time regulations.
US to widen travel ban to more than 30 countries, Noem says
The US has announced plans to expand the number of countries covered by its travel ban to more than 30, US Homeland Security Secretary Kristi Noem said on Thursday.
Putin visits Delhi as Russia, India seek to increase and diversify trade
Russian President Vladimir Putin arrived in New Delhi on Thursday to start a two-day state visit, and India and Russia both said they want to boost mutual trade and expand the variety of items in transactions.
Hong Kong races to remove scaffolding nets blamed for fuelling deadly fire
Hong Kong authorities rushed on Thursday to remove mesh netting on all buildings undergoing renovation across the city after the material was blamed for fanning a blaze last week that has killed at least 159 people.
