It could easly be shipped via ship/air to say Venezuala and from there either floated by boat, ship or even semi submersible dope subs along the gulf coast. By land it could travel along the drug highways via truck or rail.
“These are the guys who used a $1.99 box cutter to drop the WTC on 9/11″ they do this stuff on the cheap.
Missiles are not needed more nukes are needed so Pakistan starts production with two new reactors, NorKs build the weapons and Iranian or other ‘s will pilot the suicide crafts to targets, ya cannot stop them all.