What's at stake as Trump prepares to meet Putin in Alaska?

In this combination of file photos, President Donald Trump, left, and Ukraine

Trump said Ukrainian President Volodymyr Zelenskyy was unlikely to be included in talks he described as a "feel out meeting" to better understand Russia's demands for ending its war in Ukraine.

(Image credit: Aurelien Morissard, left and center, Pavel Bednyakov, right)