US President Donald Trump has warned Iran against its demand for a $2 million toll from commercial ships navigating the Strait of Hormuz, arguing it violates the UN Convention on the Law of the Sea (UNCLOS). The strait is a critical passage for 20% of global energy supplies, making its regulation a significant issue. While Iran signed UNCLOS in 1982, it did not ratify it, leading to claims that it is not bound by its provisions. Nonetheless, international law, including customary practices, suggests that Iran's toll is contrary to accepted norms. Experts argue that charging a toll for passage through an international waterway sets a dangerous precedent, potentially allowing other nations to impose similar fees in the future. The Strait of Hormuz, approximately 21 nautical miles wide at its narrowest point, is bordered by Iran and Oman, both of which have overlapping territorial seas. Iran's recent actions, including establishing a controlled shipping corridor, raise concerns about global energy security and could lead to increased prices for oil and gas, further affecting the global economy.