A source familiar with the Russian diplomatic note said it was expected that Moscow would protest the shipments, and it was still unclear whether it means Russia will change its behavior in any way. But this person acknowledged that the note could signal a more aggressive Russian posture against the US and NATO as the war drags on.

One administration official told CNN the Russian notice indicates how effective the US weapons shipments to Ukraine have been. The official suggested the Russians were also concerned by the latest announcement, which includes more sophisticated and heavier duty weaponry.

Some Biden administration officials believe that the diplomatic note shows the Russians are hurting, a senior administration official said. This official said the Russians would not have sent that message if they felt they were in a strong place on the battlefield.