I am pretty confused by the article.

What I'd expected based on what I've seen so far was that the Kremlin would not care what protocols are used, just whether the a given VPN provider was in Russia and whether it provided the government with access to monitor traffic in the VPN.

So, use whatever VPN protocol you want to talk to a VPN provider where we can monitor or block traffic by seeing inside the VPN. You don't get to talk to any VPN providers for which we can't do that, like ones outside Russia, and the Russian government will do what it can to detect and block such protocols when they pass somewhere outside of Russia.

But that doesn't seem to fit with what the article says is happening.

The media in Russia reports that the reason behind this is that the country isn’t banning specific VPNs. Instead, it’s putting restrictions on the protocols these services use.

According to appleinsider.ru, the two protocols that are subject to the restrictions are:

• OpenVPN
• WireGuard

A Russian VPN provider, Terona VPN, confirmed the recent restrictions and said its users are reporting difficulties using the service. It’s now preparing to switch to new protocols that are more resistant to blocking.

I don't see what blocking those protocols internal to Russia buys the Kremlin -- if Terona conformed to Russian rules on state access to the VPN, I don't see how the Kremlin benefits from blocking them.

And I don't see why Russia would want to permit through other protocols, though maybe there are just the only protocols that they've gotten around to blocking.

EDIT: Okay, maybe Terona doesn't conform to state rules or something and there is whitelisting of VPN providers in Russia actually happening. Looking at their VK page, it looks like Terona's top selling point is "VPN access to free internet" and they have a bunch of country flags of countries outside of Russia. So maybe Russia is blocking VPN connectivity at the point that it exits Russia, and it's affecting Terona users who are trying to use a VPN to access the Internet outside Russia, which would be in line with what I would have expected.