The United States has begun a naval blockade of Iranian ports after a deadline passed on Monday evening, with the US navy now intercepting and inspecting ships that have visited Iranian ports in a move set to escalate tensions in the Middle East.

The blockade, which was announced in advance, is a significant escalation of the long-standing dispute between the US and Iran, and is likely to have major implications for global oil supplies and prices. The US has warned that any ship that visits an Iranian port will be subject to inspection and possible detention, a move that Iran has condemned as an act of aggression. Iran has retaliated by warning that Americans will face higher pump prices due to the prohibition, which is likely to disrupt global oil supplies and drive up prices. The move is the latest in a series of escalating tensions between the two countries, which have been at odds over a range of issues, including Iran's nuclear programme and its support for militant groups in the region.

The blockade is part of a wider pattern of escalating tensions between the US and Iran, which have been building for several years. The US has imposed a series of sanctions on Iran, including a ban on the importation of Iranian oil, in an effort to pressure the country into abandoning its nuclear programme and supporting militant groups. Iran has responded by increasing its support for militant groups in the region and developing its own military capabilities, including a ballistic missile programme. The blockade is the latest in a series of moves by the US to increase pressure on Iran, and is likely to be seen as a major escalation of the conflict. The move is also likely to have major implications for global oil supplies and prices, as Iran is a major oil producer and any disruption to its supplies is likely to drive up prices.

The reaction to the blockade has been swift and condemnatory, with Iran warning that it will take all necessary measures to protect its sovereignty and interests. The move is also likely to be opposed by other countries, including European nations that have been trying to maintain a dialogue with Iran and avoid escalating the conflict. The US has defended the move as necessary to protect its national security interests and prevent Iran from developing nuclear weapons. The next steps in the crisis are unclear, but it is likely that the situation will continue to escalate in the coming days and weeks. The US and Iran are likely to engage in a war of words and diplomatic manoeuvring, with each side trying to gain the upper hand and achieve its objectives. The implications of the blockade are far-reaching and could have major consequences for global oil supplies and prices, as well as the wider Middle East region.