Washington, Aug. 13 -- The ban on purchases of products and services from Huawei, ZTE and other Chinese tech companies for the US federal agencies has entered into force on Tuesday, according to an entry on the US Federal Register website.

The document titled "Prohibition on Contracting for Certain Telecommunications and Video Surveillance Services or Equipment" bans certain US state agencies, namely the Defense Department, General Services Administration and NASA, from purchasing equipment and services from a number of Chinese tech companies effective on Tuesday.

The ban covers the telecommunications equipment produced by Huawei Technologies Company or ZTE Corporation or any of their subsidiaries and affiliates, as well as the video su...