The UK is making its largest investment in military spending since the Cold War.
An extra £16.5bn ($22bn) will be committed over the next four years.
It includes a new agency for artificial intelligence, a new national cyber force, and a space command which will be rocket-capable by 2022.
Prime Minister Boris Johnson says it's in recognition of the world being 'more perilous and more intensely competitive' than it has been since the Cold War.
Opposition Labour say the money must be spent wisely and not repeat mistakes made by previous Conservative governments.
Defence Secretary Ben Wallace says the government has its priorities right.
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