The Asia Maritime Transparency Initiative (AMTI), part of Washington’s Center for Strategic and International Studies, said the J-11 fighter was visible in a satellite image taken on March 29 of Woody Island in the Paracel island chain.

News of the sighting came as Trump was in Florida for meetings with China’s President Xi Jinping on Thursday and Friday at which he is expected to air U.S. concerns about China’s pursuit of territory and militarization of outposts in the South China Sea.

“This isn’t a first, but it’s the first time in a year,” AMTI director Greg Poling said of the jet sighting.

Referring to the single fighter plane visible in the image, he said: “There are likely more in the hangars nearby.”