Donald Trump had good reason to gloat over Joe Biden’s press conference flub referring to ‘Vice President Trump’. It was preceded earlier in the day by Biden calling Ukrainian president Volodymyr Zelensky ‘President Putin.’ Biden, in other words, was at it again.

But Biden adeptly seized the opportunity to offer a little lesson in foreign affairs in his presser at the Nato summit in Washington, zooming from Ukraine to China to Israel.