The US decision to suspend the flow of military intelligence to Ukraine this week has aided the Russian advance along a critical part of the front, weakened the negotiating position of President Volodymyr Zelenskyy and killed many Ukrainian soldiers in recent days, according to 5 senior Western and Ukrainian officials and military officers familiar with the situation. “As a result of this pause, there are hundreds of dead Ukrainians,” an officer told TIME. The impact on the Ukrainians has been most acute in the Russian region of Kursk.