if a nuclear submarine launches a tomahawk with a non-nuclear warhead is the entire weapons system "a nuclear weapon" in your eyes? Is that a breach of the arms treaties, and breaches "no first strike" posture and invites second strike response with nuclear warheads?
Apparently you haven't noticed that Tramp has been purging anyone loyal to the United States as a country and installing subservient apparatchiks in their place. This is not a dynamic which selects for intelligence, competence, or subject matter focus.
Unless there are some shot holes prepped, there is a bit of engineering to get there first. "As quickly as possible" is slow, unless you repudiate the other treaty and do an above ground or underwater shot which the US hasn't done since 1992 and even then it was basically a buried one. It hasn't done an underwater test for far longer.