London (CNN Business) 1. Tech war: Rising tensions between the United States and China are starting to hit home for more top tech companies.

Google GOOG is cutting back on its business with Huawei following an order from the Trump administration barring American companies from selling to the Chinese tech firm without a US government license.

Huawei relies on Google's Android operating system for its devices, as well as the Google Play app store.

"We are complying with the order and reviewing the implications," a Google spokesperson said Monday.

Samsung SSNLF The restrictions deal a huge blow to Huawei's ambitions to overtakeas the world's biggest smartphone maker. Huawei phones are much less attractive outside China without Google services, according to analysts.