A friend of mine got an offer to sell his 600 BTC to some chinese businessman.
The problem is how to transfer money from China to EU.
Do you have some ideas?
Getting money from someone in another country is going to be risky. I suggest that he gradually sell those Bitcoins on localbitcoins or some other site that allows cashing out.
If he insists on selling to someone in China, then he should do it in parts. Just send a small amount and wait for payment before sending another small amount. Do this until it is all sent. It could take a long time, but its safer that way.