Tariffs Meet Blockade
The U.S. has begun a naval blockade of Iranian ports and tied the move to a threat of massive tariffs — President Trump warned China could face a 50% tariff if it’s found shipping weapons to Iran. (apnews.com) Separately, Colombia drafted a decree to raise tariffs on a broad range of Ecuadorian goods to 50% after Ecuador applied duties to Colombian imports in March, signaling a regional spike in tariff retaliation. (el-balad.com)
The United States has paired a military choke point with a trade threat, saying ships to Iran could be blocked and arms suppliers could face 50 percent tariffs in the American market. (apnews.com, cnbc.com) President Donald Trump said on April 12 that the United States Navy would stop ships from entering or leaving the Strait of Hormuz after talks with Iran in Pakistan ended without an agreement. The Associated Press reported United States Central Command said the blockade of Iranian ports would begin Monday, April 13. (apnews.com, cnbc.com) Four days earlier, on April 8, Trump said any country found supplying military weapons to Iran would be hit with a 50 percent tariff on all goods sold to the United States, with “no exclusions or exemptions.” Reuters, CNBC and Politico all reported the warning, which Trump aimed in part at China after reports it could send arms to Tehran. (cnbc.com, politico.com, hindustantimes.com) A blockade tries to cut off a country’s trade by sea. A tariff raises the cost of goods at the border, so Trump is using one tool to squeeze Iran directly and another to punish any outside government that helps arm it. (apnews.com, politico.com) The same week, a separate tariff fight flared in South America. Colombia’s trade ministry published a draft decree on March 2 to raise duties on roughly 300 Ecuadorian goods from 30 percent to 50 percent after Ecuador lifted its own tariff on Colombian imports to 50 percent effective March 1. (bloomberg.com, supplychainbrain.com, financecolombia.com) Colombia had already imposed a reciprocal 30 percent tariff on Ecuadorian goods in Decree 170 of 2026, signed on February 24, and Ecuador answered by increasing its “security fee” on Colombian imports from 30 percent to 50 percent. Investing.com reported Colombia’s draft decree said Ecuador’s tariff made Colombian exports “economically unviable.” (financecolombia.com, in.investing.com) The Colombia-Ecuador dispute shows how fast retaliation can stack up once one side moves from a targeted duty to a broad surcharge. Bloomberg reported the Colombian draft still needed publication in the official gazette to take effect, which left room for negotiation even as both sides moved to 50 percent. (bloomberg.com, supplychainbrain.com) In Washington, the legal footing is less settled. Politico reported it was not clear Trump had the authority to impose a blanket 50 percent tariff on countries that arm Iran, even as he framed the policy as immediate. (politico.com) In both cases, tariffs are being used less as routine trade policy than as pressure in a broader conflict. The next test is whether the threats stay leverage or harden into lasting barriers at sea and at the border. (apnews.com, bloomberg.com)
