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"It was a big week for Ukraine, because they were allowed to fire US missiles into Russia. And they did. Putin accused the West of escalating the conflict, and then fired a ballistic missile at Ukraine. It wasn't intercontinental, but it was still pretty big and could carry a nuclear warhead. There was concern about all the threats he was issuing. So here I've drawn the progression of weapons, up to a nuclear bomb." - Peter Brookes