His words are a reference to the phrase "The vodka is inside, and outside it's a bottle" ("Водка внутри, а снаружи — бутылка"), it's a line from a very silly old movie.
https://youtu.be/nKyumhNmE6E

anoninko said:

His words are a reference to the phrase "The vodka is inside, and outside it's a bottle" ("Водка внутри, а снаружи — бутылка"), it's a line from a very silly old movie

But why is the rum gone.

bunkhead said:

But why is the rum gone.

Because the words rum and death are one and the same for some people.

It also seems to be a reference to the Iron Warriors Legions motto: Iron Within, Iron Without

Since the arist commentary mentions Perturabo, their leader

VTEC-Engine said:

It also seems to be a reference to the Iron Warriors Legions motto: Iron Within, Iron Without

Okay, I think you're right.