Precautions needed. Is Europe a little naïve on the subject of sovereign wealth funds? That was the adjective I used in a previous column and I should explain it. The holders of these funds (SWFs), be they Chinese, Arab or Russian, probably are sincere when they say that their sole aim is to manage the enormous financial resources entrusted to them to the best of their ability, without any hidden political or strategic ambitions. Nonetheless, account must be taken of the possible effects of...