Answer
Russian citizens do not need a visa to enter Uruguay as tourists. They can travel with a regular passport if the purpose of their trip is tourism rather than work or long-term residence.
Visa-free entry does not remove the need for basic care with documents. The passport must be valid for the trip, the name on the ticket must match the passport, and a return ticket, accommodation booking, and insurance will help you handle routine questions when travelling without relying on an internet connection after arrival.
If the purpose changes, the paperwork requirements change as well. Tourist entry is not a work permit and does not replace grounds for a long stay, so plans to remain in the country require a separate immigration arrangement.