The details about the plane and the submarine are intended to send a message. The US didn’t need to reveal information on either of these developments.
China claims nearly all of the South China Sea and the waters have become a major flashpoint in its relationship with its neighbours and the US.
The US navy said Iran's Shahed-136 drone ripped a 30-inch-wide (76 cm) hole into the back of the commercial tanker.
The material, over 360,000 pounds of urea fertilizer and ammonium perchlorate, was discovered on a 'stateless' dhow vessel in the Gulf of Oman.
The US Navy and Army blasted off a rocket from a seaside launch pad in Virginia to test nearly a dozen hypersonic weapon experiments on Wednesday to help develop the new class of weapon.
The announcement of the visit and the submarine's location was noted as unusual by analysts.
The USVs tested came in different sizes - from five to 36 feet (1.5 to 11 meters).
The Malaysian businessman removed his monitoring anklet and escaped house arrest in the United States earlier this month ahead of his impending sentencing.
Ankara's latest controversy is about Cyprus, which has worked increasingly with Israel in recent years, and with Greece.
Iran has been building up its naval presence in the Red Sea, near the coast of Yemen where Tehran backs the Houthi movement.