Amid Russia’s range of aggressive measures against Western democracies, the need for a strong U.S.-Ukraine relationship as a bulwark against westward Russian aggression in Central Europe and the Baltics is quite evident.

The U.S.-Ukraine strategic partnership is now far more robust than it was under former President Barack Obama, who displayed a conspicuous lack of interest for Ukraine. But President Trump’s statement before the recent G-7 meeting that he supports Russia rejoining the G-7 has introduced a new element. For Russia to be permitted to rejoin the G-7, it must live up to its commitments made in 1994 to guarantee Ukraine’s sovereignty when Kiev gave up its nuclear weapons.