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Europe would need 300,000 additional troops and at least €250 billion annually in extra defense spending to replace the US.
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A military simulation in Germany showed Europe would struggle to repel a Russian attack without American support.
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Key challenges: nuclear deterrence, lack of unified leadership, and limited logistics.
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Conclusion: Europe could theoretically build independent defense, but currently it is not ready to live without the US umbrella.
Sources – Agencies