U.S. announces Strait of Hormuz blockade after Iran talks in Pakistan end without a deal

Why did the blockade announcement come now?

The announcement followed failed U.S.-Iran talks in Islamabad. U.S. officials said no agreement was reached, and reporting from multiple outlets says the administration moved to increase pressure on Iran after diplomacy did not produce a breakthrough Fox News,NYT,NYT,NYT.

Is the U.S. trying to stop all shipping through the Strait of Hormuz?

Not based on the later military guidance cited in the reporting. While Trump's initial statement described blocking ships entering or leaving the strait, U.S. Central Command later said the operation would enforce a blockade on traffic to and from Iranian ports and would not impede navigation for ships traveling to non-Iranian ports NYT,NYT,BBC.

Why does the Strait of Hormuz matter so much?

It is a narrow waterway linking the Persian Gulf to the Gulf of Oman and is a major route for seaborne oil and natural gas. Because so much global energy trade passes through it, disruptions there can quickly affect shipping, oil prices and the wider economy NYT,NYT,NYT,Aol.