Adam Leong Kok Wey writes for RUSI: On 31 May 2021, the People’s Liberation Army Air Force (PLAAF) flew squadron-sized multi-role strategic airlifters, consisting of Ilyushin Il-76 and Xian Y-20 aircraft, over Malaysia’s Exclusive Economic Zone waters and the South Luconia Shoals (Beting Pattingi Ali), and reached about 60 miles off Sarawak’s coast. After repeated requests by air controllers for identification and the purpose of the PLAAF flight went unanswered, the Royal Malaysian Air Force (RMAF) scrambled Hawk 208 light fighter jets to intercept, which resulted in the PLAAF formation turning back. According to the RMAF, the PLAAF aircraft flew in tactical formation over the maritime waters that are claimed by China as part of its ‘nine-dash line’ contention over the South China Sea.
see the RUSI’s website: Airborne Assault to Occupy South China Sea Features? | Royal United Services Institute (rusi.org)