People rally in Trafalgar Square in London to mark the third anniversary of Russia's invasion of Ukraine. "I'm just really, really grateful for all the people in the UK for the support," says Volodymyr Gamula, but for Maxim Artemchuk, "it's never enough until the end of the war." Russian President Vladimir Putin's decision to launch the invasion in February 2022 set off the biggest conflict in Europe since World War II. IMAGES AND SOUNDBITES ++ COMPLETES WITH VIDI_36YJ2EV ++