US internet giant Google, whose Android mobile operating system powers most of the world's smartphones, said Sunday it was beginning to cut ties with China's Huawei, which Washington considers a national security threat.
In the midst of a trade war with Beijing, President Donald Trump has barred US companies from engaging in telecommunications trade with foreign companies said to threaten American national security.
The measure targets Huawei, a Chinese telecoms giant in Washington's sights that is listed by the Commerce Department among firms with which American companies can only engage in trade after obtaining the green light from the authorities.
The ban includes technology sharing.
"We are complying with the order and reviewing the implications," a Google spokesperson told AFP.
The move could have dramatic implications since Google, like all tech companies, must collaborate with smartphone makers to ensure its systems are compatible with their devices.