Russians have survived the whole world sanctions - they have won the war against Ukraine and they have survived the sanctions - emerged as a strong nation - what else you want to listen about Russia?
Yes, it is true that without Russian oil and gas half of the world is immobilized. It is also true that the value of the dollar and the euro has fallen against the ruble, but it is still not possible to say how far the impact of the sanctions will go in this short period of time. But I think that at some point, if Russia's other allies are no longer there, then I think that Russia will not be able to survive.
The answer is already in your words and that is " without russian gas and oil half of the world will immobilized". In my opinion it is having a negative impact not only for half the world but indirectly for the whole world. If you look at the economic collapse of many countries because of this Russian oil and gas embargo. I don't think Rasia shouldn't any worry for those sanction , it for those who are giving sanction. Already some top countries are in bad condition for this , And there are also rumors that they are secretly buying this gass from Russia in rubles and that is why the price of the ruble is increasing against the dollar and the euro.