Deutsche Telekom has intensified its business relationship with China's Huawei despite security authorities' warnings, Handelsblatt newspaper reported on Tuesday, citing internal documents.

Deutsche Telekom, which operates in a dozen European markets, relies heavily on equipment from Huawei. Berlin has been resisting U.S. calls to exclude the Chinese company from its telecoms networks on national security grounds.

The German group has depended on Huawei as a supplier for its 5G network and broadband expansion, cloud service and television offering and the two firms had agreed to increasingly rely on "U.S.-free" network components for Telekom's 5G network, the newspaper said.

Telekom had also asked Huawei to give it a technological edge in Germany over its competitors to secure a leadership in 5G network, Handelsblatt reported.