Answer
The main challenges of adaptation are the loss of one's usual sense of competence, language barriers, loneliness, the slow pace of everyday life, expenses, and comparing a new life with the old one. At first, the country may seem vibrant, but then routine queues, contracts, and the search for housing can become tiring.
Without Spanish, an adult depends on a translator even for simple matters: dealing with a repair technician, a doctor, a bank, a school, or a rental. This takes a toll on self-esteem, especially if the person was previously confident in their profession and status. A Russian-speaking community helps but does not replace integration into the local environment.
It is useful for a family to create a support plan in advance: a financial reserve, a doctor's contact details, a regular sleep routine, language learning, and regular discussions of the burden. Not every desire to leave means failure, but it is better to make decisions not during illness, conflict, or panic, but after everyday life has stabilized.