1) Unless China is picking a fight with Malaysia then no fighter escort is necessary like in the case with Japan/Taiwan.
2) You need multiple mid-air refueling to support flights this far. Quantity of refuelers is one of the weaknesses with PLAAF.
Based on this map
![IMG_20210601_232459.jpg IMG_20210601_232459.jpg](https://www.sinodefenceforum.com/data/attachments/66/66453-5c2512ba8f6b964666070310da1e7012.jpg)
![images - 2021-06-01T232850.951.jpeg images - 2021-06-01T232850.951.jpeg](https://www.sinodefenceforum.com/data/attachments/66/66454-e341e2f8be41885187924008d41dc2cc.jpg)
If the Air Group take-off from Yongshu Island (Reef) The fighters wouldn't need air refueling