Kyiv has warned that an interruption of US weapons shipments will encourage Russia to prolong the war in Ukraine, now in its fourth year.
On Tuesday the White House said it had cut off some weapons deliveries to Ukraine.
The decision was taken "to put America's interest’s first" following a defence department review of US "military support and assistance to other countries.
“The ministry particularly emphasized the need for Kyiv to strengthen its air defences as Russia continues to pummel the country with missiles and drones on a near-nightly basis.
However, Ukraine's defence ministry said it had not received any official notification from the US about the "suspension or revision" of the weapons deliveries, and urged people not to speculate on the basis of partial information.