The US has begun an operation to seize an oil tanker linked to Venezuela after tracking it across the Atlantic, a source with knowledge of the operation told CNN on Wednesday.

The U.S. was attempting on Wednesday to seize a Russian-flagged oil tanker being shadowed by a Russian submarine, after a more than two-week-long pursuit across the Atlantic as part of a U.S. “blocka...

But in a social media post on Tuesday, Mr. Trump said that Venezuela would send 30 million to 50 million barrels of oil, about two months’ worth of daily production, to the United States, and that he ...