SOFIA, Bulgaria (AP) — Bulgaria has joined other Balkan countries in signing an agreement with the United States on high-speed wireless network security aimed at excluding Chinese hardware providers.

Bulgaria joined North Macedonia and Kosovo, neighboring nations that also signed the "Clean Network" security agreement on Friday.

It is part of a Trump administration effort to exclude tech giant Huawei and other Chinese companies in 5G networks.

U.S. government officials have led a campaign across Europe and elsewhere against the inclusion of Huawei, which has been blacklisted for posing a threa...