“The US is not at war with Russia. It is not possible to be traitor to the US by supporting Russia.”
Not true. The first U.S. arrests of American Nazi spies working for Germnay was in 1938. Germany was already on the war path in Europe but formal declarations of war by France and Britain did not occur until a year later - 1939. We did not have to be at war with Germany nor even yet deliver aid to our allies in Europe to recogniza they were our allies and aiding Hitler was against our national interest.
They were arrested for espionage.
Not treason.