Each chapter fills me with more and more anxiety, this is up there with houseki no kuni in the "oh shit, i hope nothing goes horribly wrong this chapter" department
Using Ice against Russians is like using extreme humidity against the Vietnamese or using water against Venetians. You probably could have thought this out more...
@Tamerlane your last example doesn't fit so well, Venetians are terrified of water, first their city was sinking because of the weight of tourists and now there's the rising water levels from climate change