Franklin Roosevelt Administration: Message to King Peter II of Yugoslavia
(April 8, 1941)
The people of the United States have been profoundly shocked by the unprovoked and ruthless aggression upon the people of Yugoslavia. The Government and people of the United States are witnessing with admiration the courageous self-defense of the Yugoslav people, which constitutes one more shining example of their traditional bravery.
As I have assured Your Majesty's Government, the United States will speedily furnish all material assistance possible in accordance with its existing statutes.
I send Your Majesty my most earnest hopes for a successful resistance to this criminal assault upon the independence and integrity of your country.
 Department of State Bulletin, April 12, 1941.