8, and whether Ukraine can use U.S.-supplied weapons, Singh replied that the U.S. has "supported Ukraine from the beginning to defend themselves against attacks that are coming across the border."Kursk Oblast shares a 245-kilometer (152-mile) border with Ukraine's Sumy Oblast, which has been experiencing daily Russian attacks since the liberation of its parts in April 2022.Ukraine is taking action "to protect themselves from attacks" and operating "within the U.S. policy of where they can operate our weapons, our systems, our capabilities," Singh said. Singh declined to provide more details on the operation, responding that it is for Ukraine "to speak to their own operations." Responding to a question on how far into Russian territory Ukraine is allowed to strike, Singh said that the U.S.