Washington should press for Ukraine's membership in NATO

This past weekend at the Halifax International Security Forum, Ukraine's former president, Petro Poroshenko, delivered an impassioned plea to the international community to support his embattled nation. Poroshenko stated that even though he is now the leader of the opposition, he stands united with President Volodymyr Zelensky and shares his determination to continue fighting until Ukraine reconquers its lost territory. It is no small matter that, in contrast to Russia's Vladimir Putin, who has not hesitated to order the murder of his leading political opponents, Poroshenko has observed democratic norms, accepted his defeat by Zelensky in the 2019 presidential elections,…