Subject: Re: US cuts off intelligence-sharing with Ukraine
...their intelligence sharing, soon becomes the Four Eyes. Why anyone would trust us, or partner with us, at this point would be surprising.

Agreed. Anything they tell us could (and likely would) end up on Putin's desk. I would go so far as to say that it would be foolish to share any intelligence with us for at least the next four years. So if an attack on us is imminent, I wouldn't alert us if I were -for example- MI6. That could compromise the source if it was leaked to Putin (or anyone else).