[BurningFrog]

Treason is very narrowly defined in the US constitution, and has not been prosecuted since WW2.

As long as the US is not at war with Russia, spying for Russia can't be treason.

> "Treason against the United States, shall consist only in levying War against them, or in adhering to their Enemies, giving them Aid and Comfort."

[AnthonyMouse]

Note however that it could still be a violation of other laws.