Thus, control has always existed in Russia, but it was more selective

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These issues were not advertised as actively as recently. In general, selective control exists in any country. For example, in China there are both local and foreign messengers that have agreed to cooperate with the government. In Iran, Facebook and Twitter are banned. In the US, control functions are performed by CALEA (Communication Assistance for Law Enforcement Act), in Europe – LI (Lawful Interception). Thus, CALEA is a law that obliges telecommunications service providers (VoIP, broadband Internet, telephone communications) to cooperate with US government agencies: intercept information transmitted by subscribers, store intercepted call records, immediately (upon request) transfer all information to US government agencies.

An important feature of such control is that it is conducted secretly. That is why companies are more willing to cooperate with law enforcement. In Russia, they decided that citizens should know that their correspondence is “under surveillance.”

If you want, you can read the correspondence of any user in any service, finland whatsapp number list even protected by end-to-end encryption
If global control of all citizens' communications is a very resource-intensive story, then there is nothing to prevent precise control: if desired, you can read the correspondence of any user in any service, even protected by end-to-end encryption. There are at least three ways:

1. By interfering with the application process, not the transmission protocol. Essentially, by intercepting messages on end devices. There are already systems on the market that fully intercept messages, calls, files in messengers, including Telegram. Of course, this technology has enough shortcomings in terms of the method of intrusion into traffic, but the goal is achieved - communication is compromised, it is available to a third party. And it does not matter how technically elegant it is done. For example, this summer Germany passed a law that allows police officers to view all correspondence of suspects in crimes using the described mechanism.