The United States has confirmed that rounds of Chinese ammunition have been used in battlefields in Ukraine and suspects they were fired by Russian forces, government sources said Friday.

Whether the ammunition was supplied by China remains unclear, the U.S. administration sources said, while adding Washington is poised to take action if it is verified Beijing made the shipments.

Amid a myriad of disagreements between the United States and China, officials have recently said Washington possesses intelligence indicating that Beijing is considering sending arms and ammunition to Russia.