Putin can respond with sending some ballistic missiles to Cuba. Fair about and all that.
The US is not at war with Cuba. Russia is at war with Ukraine. Biden would probably surrender and give Cuba the Keys.
He will have to send Iranian or NK missiles.
It is curious, Putin has been sending Russian, NK, and Iranian munitions into Ukrainian territory for years now, but sending western weapons into Russia is some kind of escalation?
Should of thought about that before his 3 day war