Although American's strategy in SCS is unraveling, the Strait of Malacca is still tightly controlled by American. [source]The Chinese response is China–Pakistan Economic Corridor.
As part of the broad package of infrastructure projects under CPEC, an 1,100 kilometre long motorway will be constructed between the cities of Karachi and Lahore, while the Karakoram Highway between Rawalpindi and the Chinese border will be completely reconstructed and overhauled. The Karachi–Peshawar main railway line will also be upgraded to allow for train travel at up to 160 kilometres per hour by December 2019. Pakistan's railway network will also be extended to eventually connect to China's Southern Xinjiang Railway in Kashgar. A network of pipelines to transport liquefied natural gas and oil will also be laid as part of the project, including a $2.5 billion pipeline between Gwadar and Nawabshah to eventually transport gas from Iran.[source]