On Monday, the United States launched an "economic D-Day" operation aimed at isolating Iran from the global economic system. This move, described by the US as a "trade lifeline ax," threatens to penalize countries that continue to engage in business with Iran. While the exact enforcement details are still unclear, this action could potentially escalate into a direct conflict with Iran's key trade partners, particularly China, which is Iran's largest oil buyer and a vital link for Tehran's global economic integration.