[bbc] Spanish telecoms firm Telefonica and Chinese operator China Unicom have agreed to expand their alliance, with both investing an additional $500m (£312m; 367m euros) in the other.
Following the new investments, Telefonica will hold a 9.7% stake in its Chinese partner, while China Unicom will own 1.4% of the Spanish firm.
Under the agreement, China Unicom could get a seat on Telefonica's board.
In 2009, the two partners agreed a tie-up and invested $1bn in each other.
Telefonica and China Unicom strengthen ties