President Joe Biden joins leaders of Nato, the EU and G7 in response to the invasion of Ukraine.
President Biden is expected to discuss natural gas supplies, as the EU moves to reduce exposure to Russia
But the alliance has also made clear it won't become more directly involved and Mr Zelensky's repeated requests for a no-fly zone over Ukraine have pretty much been ignored. "I think an exercise like this is pretty good to have, to prove to countries like Russia… that you don't want to mess with Nato," a young Norwegian conscript called Peder told the BBC.
President Trump once questioned the very existence of Nato and French President Emmanuel Macron once called it "brain dead". But President Biden's visit to Brussels is proof that he sees it as being more important than ever to curb a more aggressive Russia.Defence strategy will also play a part in an EU summit where leaders will approve plans that aim to pull member states closer together on military planning, intelligence and procurement.
German Chancellor Olaf Scholz has publicly denounced the idea of banning Russian gas and oil imports, arguing it will drag Europe into a recession. "Sanctions must not hit the European states harder than the Russian leadership. That is our principle," he said on the eve of the summit.But there are nations agitating for action as they voice deep discomfort about handing cash to the Kremlin via energy payments. "It's blood money," said one central European diplomat.