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Europe intensifies diplomacy to shield against Chinese power

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* EU eyes defences against China's bid for superpower status

* China on EU leaders summit agenda for first time in years

* Early optimism fades over closer ties in Trump era

By Robin Emmott

BRUSSELS, March 1 (Reuters) - The European Union is seeking to forge a more defensive strategy towards China and is intensifying diplomacy to limit Beijing's ability to buy foreign firms in the bloc, its top trading partner, diplomats and officials say.

Despite an agenda dominated by Britain's imminent departure from the EU, leaders will use a March 21 summit to discuss China policy, a first for many years. It is part of a flurry of high-level meetings before President Xi Jinping travels to Italy and France and the bloc holds a summit with China on April 9.

The acceleration of diplomacy, including special councils of EU envoys, experts and foreign ministers, marks a collective reevaluation of Sino-EU ties after decades of rising trade and a feel-good factor towards Beijing that contrasted with the United States' more aggressive stance.

European optimism has turned to frustration over China's slowness to open up its economy, a surge of Chinese takeovers in critical sectors, U.S. pressure to shun China over espionage fears and an impression in Brussels that Beijing has not kept its promise to stand up for free trade and globalisation.

Four senior EU diplomats and officials in close contact with the Chinese said they were losing hope on business issues that have been limping on for years, including almost a decade of talks on a special treaty to increase investment flows.

"The Chinese say all the right things, but when it comes to taking a decision, they delay and delay," one senior EU official said, citing a missed October deadline for China to finalise a deal to recognise the EU's system of protecting food names.

China has also backed out of an agreement to invest in a multi-billion euro EU infrastructure fund.

Chinese Foreign Ministry spokesman Lu Kang told reporters on Friday that China hopes Europe can continue to provide a "fair, just, non-discriminatory environment" for Chinese companies.

With over a billion euros a day in bilateral trade, the EU is China's top trading partner, while China is second only to the United States as a market for European goods and services.

However, Chinese trade restrictions are more severe than EU barriers in almost every economic sector, according to the New York research firm Rhodium Group and Germany's Mercator Institute for China Studies. Chinese investments into the EU far outweigh those of EU companies in China in most industries, they said.