In recent news, we've learnt that Russia has allegedly begun the production of the venerable FAB-3000 bomb, sporting more than a thousand kilos of explosives; they certainly pack a punch. But why now? I see one likely and one less likely answer to this question. We'll start with the more probable: Russia intends to use these to defeat Ukraine's defences. We've seen that Ukraine has begun the construction of massive defensive lines. One key difference between their defensive lines and ours is their use of more centralized citadel-like structures in combination with trench lines and other standard defences. Usually, these...