Britain and its allies face their "1937 moment" following Russia's invasion of Ukraine and must do everything possible to avert another world war, the new head of the army has said.
The warning emerged as Prime Minister Boris Johnson is expected to announce an uplift in UK defence spending this week, in line with growing security challenges.
General Sir Patrick Sanders, the chief of the general staff, said Russian President Vladimir Putin and his "expansionist ambitions" pose the greatest threat to sovereignty, democracy and the freedom to live without violence that he has ever known.