The official also commented on the withdrawal of Ukrainian forces from Severodonetsk.
Russia is trying to prevent the supply of long-range weapons to Ukraine, but so far has not been able to succeed.
This is reported by CNBC, citing a senior US official.
Russia is trying but failing to target Western weapons entering Ukraine, including longer-range systems that Kyiv hopes will be critical on the battlefield.
The official also commented on the significance of the Russian advance in Ukraine and said that the withdrawal of Ukrainian forces from Severodonetsk would allow them to take a better defensive position.
“By moving Ukrainian military forces out of Severodonetsk, they are putting themselves in a position where they can better defend themselves,” the official said, speaking on condition of anonymity.
Recall that the White House assessed the likelihood of new deliveries of MLRS HIMARS for Ukraine. He also stressed that defense supplies are arriving in Ukraine at a record speed.