Answer
The attitude toward Russians in Uruguay is generally described as calm and positive: they are often perceived as European migrants and do not face particular everyday negativity because of their Russian origin.
The overall experience of a migrant does not depend only on their passport. Language, neighborhood, work, social circle, willingness to follow local rules, and the ability to communicate without a constant intermediary all matter. Without Spanish, a person may become isolated in a Russian-speaking environment and be less able to understand local expectations.
You cannot generalize from a single impression to the whole country. Within society, there may be different attitudes toward different migrant groups, and everyday interactions vary from district to district. In practice, it is better to assess not the simplistic “do they like you or not?” framing, but how well you can communicate, handle practical matters, and build connections in your chosen city.