Maybe the ideal scenario is that the sanctions hurt the Russian elite enough that they oust Putin (which would mean assassinate Putin). Probably the only (or at least safest) way to bring him down is from the inside. Whether that's oligarchs or top military officials, or some combination of the two, who knows, and who knows if it's even remotely likely.
Maybe when Russian oligarchs will realize that economics and whole country is in such deep shit like never before, they will start pushing Putin to end war. I think it's not bad sign that Roman Abramovich was involved in negotiation today.
But at the same time I'm afraid that Putin can feel pushed into corner without any way back. His recent decisions isn't rational and he can drop nuclear weapon. It would be end for him, but at the same time it would be end for half of world.
Seriously, where do they come up with this stuff? And they expect people to buy it?
Well, such statements from Russian foreign ministry is usual stuff. Seems that cock supply to it from Argentina never stoped (explanation for people not familiar with this stuff is below:
https://www.theguardian.com/world/2018/feb/23/russian-embassy-cocaine-buenos-aires-police-arrests