Fifth-generation mobile networks (5G) characteristics and the ban on the use of Chinese suppliers equipment in Australia, Japan, USA and other countries were motivating factors for studying the influence of equipment suppliers on 5G network security and writing this paper. An increasing number of countries considers Chinese suppliers equipment high-risk. EU recommends avoiding its use in its Member States as it can endanger 5G network security. The influence of China on Chinese companies is significant, the law prescribes the establishment of the Communist Party, carrying out supervision in companies and delivery of requested information. Huawei is China's largest 5G equipment supplier and although it strives to adapt to the security requirements of Western countries and invests heavily in the development and security of its equipment and services, it is subject to Chinese laws and is considered high-risk. The aim of the work is to describe 5G technology, 5G security architecture, leading equipment suppliers with an emphasis on high-risk ones and measures operators should take into account when choosing suppliers, with the aim of maintaining the confidentiality, integrity and availability of data while stored, processed and handled. Key words: 5G, core network, radio access network, virtualization, network slice, vulnerabilities, threats, risks, China, Toolbox, Huawei, Ericsson, Nokia