While Argentinian border control often focuses more on proof of accommodation (at least for the first night) and may not always check the outbound ticket, airlines (especially Turkish Airlines) are known to be strict and may deny boarding without one. Other airlines like Ethiopian or Emirates might be more lenient, accepting tickets to neighboring countries (e.g., ferry to Uruguay, flight to Chile costing 7,000-10,000 RUB) as proof of intent to leave. It's advisable to have some form of outbound travel planned to mitigate risks, as experiences with checks vary widely by airline and individual officer. Some airlines may even check for outbound tickets during registration in Moscow.
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