She said this during a hearing in the Senate Armed Services Committee.
"Ukraine remains heavily dependent on foreign military aid supplies and will likely not be able to counter Russia's relative advantage in manpower and resources if most Western military aid stops flowing," Haynes said.
On March 24, Deputy Chairman of the Russian Security Council Dmitry Medvedev called foreign specialists whom the West sends to Ukraine along with weapons a legitimate target for the Russian army.
As The New York Times columnists Michael Schvirtz and Stanislav Kozlyuk wrote, despite the supply of weapons by the West, the Ukrainian military speaks of the superiority of the Russian Armed Forces.