Ukraine's military wants to mobilise up to 500,000 more troops to fight Russia's invasion, but Ukrainian President Volodymyr Zelenskyy said Tuesday that he has asked them to spell out their plans in detail on what is "a sensitive matter" before deciding whether he grants their wish as the war approaches the two-year mark. Such a major mobilisation would cost Ukraine around 500 billion hryvnias ($13.4 billion), Ukrainian President Volodymyr Zelenskyy said.