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Because they had declared war on Austria-Hungary, and Germany had responded by declaring war on Russia... so Russia was at war with both of those countries. Mobilizing is when a country starts building armies and getting ready to fight a war- it can take a lot of time to do. When World War I started in summer of 1914, Russia was a very large but somewhat backwards country, so it took even longer for them to mobilize fully and then get their armies over to fight against Germany. That gave Germany time to attack France and try to defeat them before Russia was truly ready to fight- however, Germany failed to defeat France and was forced to fight both countries at the same time.

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12y ago

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