Supplying weapons to a country for defensive purposes does not require congressional approval.

Supplying weapons that are used to attack another country must gain congressional approval.

"We have not declared war on Russia. We have not made military attacks on Russia."

False. A declaration in modern terms does not have to be formal. Actions taken can be determined to be the declaration.

In addition, we have attacked Russia by proxy. If Mexico were supplied missiles by China, and Mexico launched them into Texas, what would we say?

Supplying weapons to a country for defensive purposes does not require congressional approval.

Supplying weapons that are used to attack another country must gain congressional approval.