The North Atlantic Treaty Organization (NATO) summit in Brussels on June 14, 2021, offers an opportunity for the Alliance to focus on Ukraine. Over the past two months, Russia has been conducting a sizeable military buildup along its border with Ukraine and in occupied Crimea. During this same period, fighting has increased in eastern Ukraine. The United States should rally European NATO members to show solidarity with Ukraine, help Ukraine to improve its defensive military capabilities, and ensure that Ukraine remains on the path to NATO membership.