WI United Nations forces in Korea Korean War

What if the United Nations forces had been given the ok to attack the bridges, troops, rail yards and supplies in Northern China to stop the Chinese resupplies after the Red Chinese attacked? Would this have put the world on a path to WWlll? Would this have given the Red Chinese pause or made them also attack Taiwan? Would the USSR have come in on the side of North Korea and Red China? If not the UN then what if only the US gives the ok?
 
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