F oreign dignitaries invited to the White House know a thoughtful gift can help lubricate the wheels of diplomacy. Volodymyr Zelensky, Ukraine’s president, went the safe route as he arrived in Washington this week, offering a golf club to his golf-mad host, Donald Trump. Past gifts from abroad have included a presidential private jet from Qatar, a posh set of Mont Blanc fountain pens from Angela Merkel (no match for the presidential Sharpie) and a portrait of one Donald J. Trump made with gemstones, courtesy of Vietnam. As a parade of European leaders set out for Washington to support Mr Zelensky, what memorable trinket from their home continent could they possibly bestow upon the president who has everything? Mr Trump, as it happens, no doubt had something in mind. For there is one bau

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