European leaders formally accepted Ukraine as a candidate to join the EU on Thursday, a bold geopolitical move triggered by Russia's invasion of Ukraine but a reminder that the 27-nation bloc will need a major overhaul as it looks to enlarge again.
Although it could take Ukraine and neighboring Moldova more than a decade to qualify for membership, the decision at a two-day EU summit is symbolic step that signals the bloc's intention to reach deep into the former Soviet Union.
"A historic moment," European Council chief Charles Michel tweeted. "Today marks a crucial step on your path towards the EU," he said, adding: "Our future is together."
The move, which also sees Moldova being granted candidate status, kick-starts the EU's most ambitious expansion since it welcomed Eastern European states after the Cold War.
"All the people in Ukraine are watching and waiting for this decision," said Ivan Zichenko, a 34-year-old Ukrainian from the devastated city of Kharkiv, who now lives in Brussels.
"It's very, very important to raise their morale," he said as a few dozen people chanted "Ukraine is Europe" at a rally outside the Brussels building where EU leaders were meeting.
Behind the triumphant rhetoric, however, there is concern within the EU about how the bloc can remain coherent as it continues to enlarge.
After starting in 1951 as an organization of six countries to regulate industrial production, the EU now has 27 members that face complex challenges from climate change and the rise of China to a war on their own doorstep.
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Russian President Vladimir Putin says his "special military operation" launched in Ukraine in late February was partly necessitated by Western encroachment into what Russia characterizes as its rightful geographical sphere of influence.
The EU's green light "is a signal to Moscow that Ukraine, and also other countries from the former Soviet Union, cannot belong to the Russian spheres of influence," Ukraine's EU ambassador Chentsov Vsevolod told Reuters earlier on Thursday.
"There are Ukrainian soldiers calling home from the front line and asking: what is happening with our candidate status? It's amazing how important it is for Ukrainian people."
While Ukraine and Moldova were expected to be welcomed into the EU's waiting room, Georgia was given "a European perspective" but told it must fulfill conditions before winning candidate status.
Reticence over EU enlargement has slowed progress towards membership for a group of Balkans countries – Albania, Bosnia, Kosovo, Montenegro, North Macedonia and Serbia – whose leaders met their EU counterparts in Brussels in the morning.
Albanian Prime Minister Edi Rama said as he arrived at a meeting with EU leaders ahead of the bloc's summit: "Welcome to Ukraine, it's a good thing to give candidate status, but I hope the Ukrainian people will not have much illusions about this."
A draft of the summit statement showed that EU leaders will again give "full and unequivocal commitment to the EU membership perspective of the Western Balkans".
But Ukraine's fast track to formal candidate status has only served to increase their feeling of being sidelined, which carries the risk for the EU that Russia and China extend their influence into the Balkan region.
"The more the EU doesn't give a unified and a clear sign to the Western Balkans, the more other malign factors will use that space and that vacuum," Kosovo President Vjosa Osmani said.
German Chancellor Olaf Scholz said this week that the EU must "reform its internal procedures" to prepare for the accession of new members, singling out the need for key issues to be agreed with a qualified majority rather than by unanimity.
The requirement for unanimity often frustrates EU ambitions because member states can block decisions or water them down.
Despite waves of crises that have rocked the EU, from migration and Britain's exit from the bloc, the union remains popular, with a survey this week showing approval for EU membership is at 15-year high.
Still, public discontent is mounting over inflation and an energy crisis as Russia tightens gas supplies in response to sanctions, issues for the second day of the summit on Friday.