a fire truck costs $250000. for the truck. If you don't need a 150 foot ladder and 1000 gallons of water, then a tool-truck like many contractors have would probably do for much less cost.
new zealand gave the big F U to the USA back in the 80s when they refused the USS Buchanan nuclear powered destroyer entry to the port as it violated the nuclear-free legislation.
Harbouring Snowden would probably create a lot more tension than just refusing a port entry to a specific boat, though I don't know the rest of the context of that incident.
