Direct answer
Georgia and Armenia are examples of third countries for transferring money from Russia to Uruguay. In these countries, an intermediate exchange of rubles for dollars or euros is possible before further transfer.
This route is used because direct transfers from Russia can be difficult: not all banks are prepared to deal with Russian accounts and the source of funds. A third country serves as an intermediary but does not eliminate document requirements.
The main risk of a transit transfer is losing transparency in the chain. You need to understand in advance who the sender will be, which currency will be exchanged, what fees will be incurred, and which documents will confirm the entire path of the money to Uruguay, including the intermediate exchange.