South Korea scrambled fighter jets on Tuesday after several Chinese warplanes and more than a dozen Russian aircraft entered its air defense zone. The South Korean Joint Chiefs of Staff said the incident may have been a “joint military drill between China and Russia” but noted that “further analysis” is needed, according to the Reuters news agency. About 15 Russian military jets and four Chinese military planes entered South Korea’s air defense identification zone, officials told the news agency. South Korea said the Chinese military said it was performing routine training before the aircraft entered the zone. South Korea said it contacted the foreign ministries of Russia and the Chinese Communist Party (CCP) about the alleged incident, according to Yonhap. South Korea’s Joint Chiefs of Staff said the Russian planes flew from north to south over the East Sea, according to the Korea Herald. They then headed northeast. The Chinese planes flew …