Meaning of "No Russian" in Call of Duty: Modern Warfare 2

What was meant by "Remember - No Russian" in Call of Duty: Modern Warfare 2?
Did it mean "Don't Speak in Russian"? Or "Don't leave any Russians alive"?
A Wikipedia article mentioned that a Japanese translation of the game translated it as something like kill them all, they are Russian, and that the game's producer said it was a mistranslation but they wouldn't fix it.
Did any translations of the game into other languages translate it to have the other possible meaning (no Russian language)?
Also, "No Russian" in the sense of "Don't leave any Russians alive" would be mildly ungrammatical. Was the ultranationalist who said this speaking in English, and if so, was he bad at English?
Best Answer
As they were trying to frame the US as being behind (or involved in) the incident, I think that the phrase 'No Russian' can be interpreted as meaning 'Do not speak Russian'. It might be translated differently in other languages but as English is the original language, I think that we can safely disregard the translations that would go against this.
This is at least how I took it when playing the game for the first time and never considered that it could be taken any other way.
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What did Makarov mean when he says No Russian?
The leader of the terrorists, Vladimir Makarov, tells his co-conspirators, "Remember, no Russian", implying that speaking Russian would reveal their ethnic origins and affiliation to the Russian ultranationalists.Why do they say No Russian in mw2?
'No Russian' is the name of the game's fourth level. The name is taken from main villain Vladimir Makarov's insistence that no one on the strike team speak their native tongue. Makarov is hell bent on revenge for the death of his commander, Imran Zakhaev, even if that means war with the United States.What is the disturbing content in mw2?
One of the most arguably infamous of these controversies is found in the game's fourth level, "No Russian", where the player controls an undercover CIA agent who participates in a mass shooting at a Moscow airport to gain the trust of a Russian terrorist group.Why does Makarov shoot Yuri?
However, Yuri was killed by Makarov in a joint effort between him and Price to kill Makarov to avenge Soap's death.THE TRUTH ABOUT THE \
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Answer 2
This is answered canonically in the Museum epilog of Modern Warfare 2.
In the No Russian museum display there is a plaque that describes the events of the level. The plaque reads that Makarov had "instructed his men to 'not speak Russian'..." Given that there was nearly no other spoken dialog in the mission it points to "speak only English" is the meaning of "no Russian."
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Images: Sy Donny, Andrea Piacquadio, Andrea Piacquadio, SHVETS production