Okay, the user wants me to translate "established a base" into Russian. Let me check the rules again. The first rule says to translate all content into Russian. The second rule states that if the content is already in Russian, leave it as is. The third rule is to provide only the translation without any explanations.
So, the input here is "established a base". The user hasn't specified the language of the original text, but since it's in English, I need to translate it. The Russian translation of "established a base" would be "основали базу". Let me confirm that. "Established" is "основали" (past tense of основать), and "a base" is "базу" (accusative case because it's the direct object).
Wait, is there any context that might change the translation? For example, if "base" refers to a military base, it's still "базу". If it's a different type of base, like a business base, it might still be the same. The user didn't provide additional context, so the straightforward translation should be correct.
Also, the user mentioned that if the content is already in Russian, output it unchanged. But here, the original is in English, so translation is needed. I should make sure not to add any explanations, just the translation. So the correct response is "основали базу".
основали базу
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