The Army Life for me! The POG life for me!
Vietnam has growing relations with us, and the people actually tend to like America therePakistan is the only one of those nations that has any meaningful ability to support China in any kind of conflict (NK could if it was against SK), all the rest are utterly irrelevant to a conflict with Taiwan.
Support for something in UN resolutions means absolutely nothing in regards to support in a military conflict.
The UN's favorite pastime is passing resolutions against Israel for various reasons. Basically every Arab and Muslim state backs these in lockstep, and yet exactly how many of said nations are supporting Hamas now that the Israelis have gone to war?
Exactly none of them.
Similarly, while China may be able to pressure, bribe, and bully support for UN resolutions out of various minor nations, and even nominally hostile nations, that costs those nations just about nothing, whereas supporting China in a war could cost them overnight economic collapse if they're cut off from US export markets, or the SWIFT network.
What are Cuba or Venezuela going to do, even if they do 'back' China in a conflict? Threaten to invade Florida? The US Coast Guard and a couple states National Guard could crush these nations militaries, and they have zero ability to project force outside of close range to their own territory.
The nations that actually matter in a conflict with Taiwan, are Vietnam, Philipines, Indonesia, Malaysia, and Japan. Arguably the Koreas as well, but they basically keep each other counterbalanced out of things.
All of these nations, China has bad relations with, and has actively been pissing off lately with their absurd territorial claims and 'wolf-warrior' diplomacy. China tried to invade Vietnam in living memory, and has a long history of being imperialist bastards to everyone on that list.
The US, on the other hand, has good relations with every nation on the list except Vietnam, and they have a lot less beef with us than they do the Chinese.
If Russia wasn't bleeding itself white trying and failing to subjugate Ukraine, they might have been relevant to the conflict, but at this point all that really matters, is how they've shown the whole world that American/NATO military hardware is far, far superior to what the Russians have been putting out onto the market for the last twenty years. And Taiwan is loading up on American kit, while a huge portion of Chinese military hardware, an outright majority when it comes to their airforce, isn't even Russian kit, but inferior domestic knock-offs to Chinese kit.
...I am having a hard time understanding someone like you has developed such an utterly backwards understanding of things like this.
The reason the U-boat campaigns were sinking hundreds of ships, and killing lots of civilian and military sailors, is because the Germans in both WWI and WWII were the underdog in the naval conflict, trying to fight against the World Hegemon and most powerful Navy of the world, the United Kingdom, which also had tacit and then explicit support from the USA, the runner-up to the most powerful Navy in the world.
The Royal Navy enforced a blockade of civilian shipping to Germany and Italy through the Atlantic or western Mediterranean, and after America joined the war, the eastern Medieterranean as well.
Do you know how many civilian freighters they had to sink to enforce this blockade?
(There were some military-use transports they attacked while fighting the Italians in the Med)
Because when you are the undisputed master of the high seas (which Britain was, and America is), you don't need to sink civilian shipping, you simply sail within weapons range, then inform the civilian ship that they're not allowed to go to the nation you don't want them to go to, so they'd best turn around, unless they would like to force the issue.
Historically, merchant ship captains don't force the issue.
If the USA decides to enforce a naval blockade against China alone, what that will look like is a US Carrier Battle Group parking itself in the lower reaches of the South China Sea, and telling every freighter flagged to travel to or from China to GTFO of the war zone. If any get aggressive and try to refuse, given the fact that civilian freighters and their crews are unarmed, would be a contingent of marines being sent over on a helicopter to enforce the matter, no bloodshed needed.
In the far more likely event that Indonesia, Malaysia, Philipines, Vietnam, etc, sign on to the embargo, the US wouldn't even need to do anything directly. The Indonesians and Malaysians would get to flex their muscle on the international stage by telling any ship flagged to travel to China through the Straits of Malacca, or any of the more southerly Indonesian-controlled straits, has to turn their asses around, straits are closed to them.
All these allied nations get to play in the big leagues, go on visible military exercises with the most powerful navy in the world, and win a lot of points with both the USA, and everyone else in their neighborhood who doesn't like China. They'll be high up on the list of places to rebase low-labor-cost manufacturing that's not going to be happening in China anymore, it's basically all positives for them.
And there is absolutely nothing the Chinese can do about it.
The overwhelming majority of the PLAN can't project out as far as the Straits of Malacca, and what parts can, probably couldn't beat those local nations in a fight off their own coasts, much less the USN. Malaysia and Indonesia could close the straits with WWI-tier conventional tube artillery even if the PLAN did manage to defeat their navies in the area.
So, in short, *yes*, the USA can enforce a blockade without needing to start sinking a bunch of ships, and if China wanted to even try to break that blockade, they would need to start shooting at the USN, which brings you back to the 'America starts shooting down the entire PLAAF' scenario of my prior post.