The U.S. military has flown a pair of fighter jets over the Gulf of Venezuela in what appears to be the closest American warplanes have come to the South American country’s airspace since the start of the Trump administration’s pressure campaign.

A JetBlue plane almost collided with an Air Force tanker near Curacao on Friday, raising questions about safety around military flights.

The US Federal Aviation Administration has issued a notification to pilots to exercise extreme caution due to a “worsening security situation and heightened military activity” around Venezuela, as President Donald Trump ramps up pressure on Nicolas Maduro.

Chinese officials took issue with Japan’s claim. Wang Xuemeng, a spokesman for the Chinese Navy, said in a statement that the Liaoning was carrying out “routine carrier-based fighter jet flight training” that had been announced in advance.

U.S. military jets on Saturday intercepted a civilian aircraft that flew through temporarily restricted airspace over Palm Beach, Florida, where President Trump's Mar-a-Lago estate is located, according to the North American Aerospace Defense Command.

Air traffic recordings reveal a JetBlue pilot’s alarm after a close encounter with a U.S. Air Force plane in Caribbean airspace near Venezuela.

Just hours after passing a massive defense bill that included the worrisome provisions about military flights, the Senate approved a bipartisan bill that will require all aircraft use ADS-B technology — or Automatic Dependent Surveillance–Broadcast technology — to broadcast their locations.

The move Tuesday appears to be the closest American warplanes have come to the South American country’s airspace since the start of the Trump administration’s pressure campaign in the region.