Hundreds of people protested in London on Saturday demanding an end to Russia’s devastating invasion of Ukraine, praying for peace amid a host of blue and yellow national flags. The large crowd gathered on the central Trafalgar Square, singing the national anthem while draped in Ukrainian flags and calling Russian President Vladimir Putin a “terrorist”. “When the last Ukrainian soldier falls, Putin will come for you ladies and gents,” read a giant banner. “I’m Ukrainian and I still have some family and friends in Ukraine,” said Olena Marcyniuk, 36, at the protest with her children aged 14 mont…