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That could prove too tempting a challenge to overlook.

But could a one-off such tax ever be tempting as ministers confront awkward spending squeezes in places and that ever growing demand for defence spending?

With the presence of Chinese investors dwindling at European clubs, and with the men's national team still struggling to make inroads on the pitch, it is tempting to write off Xi's ambitions already.

If they didn't, the advantages to Russia might be tempting.

"It's very tempting to set up rules," she once said.