It is morally as indefensible for a nation to commit a wrong upon another nation, strong or weak, as for an individual thus to wrong his fellows.
 Theodore Roosevelt, State of the Union Address. copy citation

Context

“As has been well and finely said, a beaten nation is not necessarily a disgraced nation; but the nation or man is disgraced if the obligation to defend right is shirked. We should as a nation do everything in our power for the cause of honorable peace. It is morally as indefensible for a nation to commit a wrong upon another nation, strong or weak, as for an individual thus to wrong his fellows. We should do all in our power to hasten the day when there shall be peace among the nations--a peace based upon justice and not upon cowardly submission to wrong. We can accomplish a good deal in this direction, but we can not accomplish everything, and the penalty of attempting to do too much would almost inevitably be to do worse than nothing;” source