When U.S. President Donald Trump and Russian President Vladimir Putin met in Helsinki in 2018, the pair alarmed allies with a friendly encounter where Trump sided with the Russian leader over his own intelligence agencies on election interference.

Trump flies to a meeting in Alaska with Putin on Friday in a different public mood — impatient with the Russian's unwillingness to negotiate an end to his war in Ukraine and angry over missile strikes on Ukrainian cities.

The world is waiting to see if it will be this tougher version of Trump who shows up in Anchorage or if it will be the former real estate tycoon who has sought to ingratiate himself with the wily former KGB agent in the past.