Sometimes, Western nuclear threats against non-nuclear weapon states have been covert operations, signalled secretly by mobilising strategic nuclear weapon systems (like the British V-bombers sent out to Singapore during the Malaysian Confrontation – see PN 2659).
Sometimes, Western nuclear threats have been very, very public.
Such was the case in the run-up to the March 2003 US-UK assault on Iraq.
It was a very long run-up to war, for reasons discussed…