WARSAW — A massacre of civilians outside of Kyiv is just “the tip of the iceberg,” according to Ukrainian Foreign Minister Dmytro Kuleba, who cited the apparent Russian war crimes while demanding additional economic sanctions on Russia and arms for Ukraine.

“Half-measures are not enough anymore,” Kuleba said after a meeting with British Foreign Secretary Liz Truss at the United Kingdom’s embassy. “I have heard dozens of arguments why this or that sanction cannot be imposed against Russia. It’s time to put all hesitation, reluctance, business-wise arguments aside and think about human sufferings and the need to stop the Russian war machine [before] it kills and destroys more on its way.”