We could probably rally the Occupy movement and accidentally lead them into Liechtenstein. And then boom! DPRL.
We have the LHC! WE will destroy all opposing forces with a black hole! Also lol Austrian military.......... The only country that is even more worthless in a war then Switzerland. Their whole Airforce consists of the old jets we didn't want anymore. On a side note, Lichtenstein is defacto protectorate of Switzerland.
Well I already suggested the Sovereign Military Hospitaller Order of Saint John of Jerusalem of Rhodes and of Malta, they have two buildings in Rome and one castle in Malta.
We need to take over Antarctica first. That way we get hordes of penguin soldiers which we can use to TAKE OVER THE WORLD!!!
Well wikipedia tells me that they have something like 80 police officiers with 30 support staff so we'd have to kick off the invasion with a fire bombing on the police christmas party. Catching them off guard, we sack the police station and steal all weapons and ammunition.
I say one of our most dedicated members hijacks a plane inbound for Liechtenstein, and then dives it into their capital, or something else important to them.