KYIV — Ukraine's allies have provided an unprecedented amount of military aid, but delays in deliveries have enabled Russia to make battlefield gains, NATO Secretary-General Jens Stoltenberg said in the Ukrainian capital on Monday.

NATO's chief expressed his disappointment on Monday, stating that member countries have not fulfilled their promises to Ukraine in a

Jens Stoltenberg, chief of NATO, visited Kyiv, Ukraine, to admit that the military alliance fell short of their promises of arms to Ukraine, but reaffirmed commitment to the cause.