We will not be intimidated by the threats of dictators that they will regard as a breach of international law or as an act of war our aid to the democracies which dare to resist their aggression. Such aid is not an act of war, even if a dictator should unilaterally proclaim it so to be.

Franklin Delano Roosevelt (1882-1945) American lawyer, politician, statesman, US President (1933-1945)
Speech (1941-01-06) to Congress, Annual Message (State of the Union), “Four Freedoms,” Washington, D. C.
    (Source)