You are forgetting China here. 70% of mobile phone market in India is dominated by Chinese phones which are honestly far more feature packed than the latest iPhone. Of course one does not have any idea about privacy/security aspects of it. Will definitely not be as secure as an iPhone. But for a regular user, does this actually matter? Especially in developing countries? More so in Russia?
When Soviet Union collapsed, China's GDP was slightly higher than India's GDP. It wasn't yet the manufacturing base and supply chain of the World. The West propped China up for 3 decades. Now Russia/Russians won't miss out much to be honest with you. There are alternatives for everything Western and then some.
> countries will make sanctions even stronger
In what way? The sanctions are already the strongest. There is nothing more "stronger" that can be done now. What can be "stronger" than cutting off financial telecommunications (through SWIFT)? Cutting off oil? That can be easily re-routed to India and China. India and China will love discounted Russian oil.
I think the West is overestimating the impact of Sanctions.