To achieve this, on 8 December 2020 Putin signed a series of amendments that stipulates that Russian law precedes international agreements and decisions made by international institutions.7
This means that Russia will not carry out any decisions made by an international authority - it will simply say that it contradicts the Russian constitution. There have already been cases when Russia has stated that a ruling by the European Court of Human Rights goes against the constitution of Russia and therefore will not be carried out.
Essentially, Putin's clique can do whatever it wants, and no one can do anything about it. If they don't like someone - for instance someone like Navalny - they will make up a law or won't even bother with hiding behind laws and simply imprison the person.
No international institution will be able to object, no convention will have any power because the Russian court will have made its decision. We will not dive any deeper, for instance, into the fact that courts hand out sentences according to the wishes of particular persons. But the main takeaway is that Russia can do whatever it wants.
However, there's one thing that the bunker grandpa hasn't taken into the consideration - yes, Russians are very patient, but even patience has its limits. It's difficult to predict what these protests will result in, but there definitely is a sense that this is the beginning of the end of Putin's era.
7 https://tass.ru/politika/10199979
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