Google has sold its Motorola handset unit to China's Lenovo for $2.9 billion.

This is Lenovo's second big U.S. deal in a week. It also agreed to buy IBM's low-end server business for $2.3 billion.

Google paid $12.5 billion for Motorola in 2012.

A 'vast majority' of the firm's patents will stay with Google.

The deal will help Lenovo compete in developed markets with Samsung and Apple.

But selling Moto may also mean a tighter Google/Samsung relationship.