And on Iran, both sides want to do what they can to protect the deal they helped negotiate to curb Tehran's nuclear ambitions. So Friday's meeting may have allowed both sides to rehearse their differences - and the veteran Russian foreign minister, Sergei Lavrov, gave as good as he got from the comparative novice foreign secretary, Boris Johnson. But it also allowed them to crack a few jokes and build a relationship that they could need in the years to come. This was not a reset or a return to business as usual but the opening of a channel of communication that in recent years has been as

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