unless you are talking about a seaborne amphibious landing without ground line of communication support, China would need to attack either Vietnam and Laos, or Myanmar to establish a GLOC in order to support the seaborne invasion in either Malaysia or Thailand because China have no border to either Thailand or Malaysia, especially so for Thailand because it is on the other side of South China seas, it's on the Indian Ocean. Otherwise, Chinese troop would have been slaughtered D-Day style because Chinese sealift capability is below 20000.I don't know why you need to attack Vietnam to secure the Malacca strait Vietnam is way out in Indochina. The road to Malaysia runs through Laos which is a Chinese ally they just finished HSR last year and it ends in Vientiane just close to the border of Thailand. Plan is afoot to continue from Vientiane to Bangkok in 2 phases Bangkok to Nakhon Rachasima and then to Vientiane. The first phase is in construction
The Kunming–Singapore railway, also referred to as the Pan-Asian Railway, is a network of railways that connects China, Singapore and all the countries of mainland Southeast Asia. The concept originated with the British and French colonial empires, which sought to link the railways they had built in southwest China, Indochina and Malaya, but international conflicts in the 20th century kept regional railways fragmented. The idea was formally revived in October 2006 when 18 Asian and Eurasian countries signed the Trans-Asian railway Network Agreement, which incorporated the Kunming–Singapore railway into the Trans-Asian railway network.
The network consists of three main routes from Kunming, China to Bangkok, Thailand: the Eastern route via Vietnam and Cambodia; the Central route via Laos, and the Western route via Myanmar. The southern half of the network from Bangkok to Singapore has been operational since 1918. The Central route opened on 3 December 2021, with the opening of the Yuxi–Mohan railway and Boten–Vientiane railway linking with the other operational segments of the route, which formally connected Kunming and Singapore directly by rail.
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Laos is not China allies, just because they build the HSR does not mean they are okay for China to use their country as base when they go to war with the US. And you can even get to Laos without go over Vietnam first.
And again, that's beside the point, as I said, it's not the troop that is the matter, it is always how you can support that troop and again, you ain't simplifying the issue by invading 2 or 3 more countries.