You could do this whole plan without needing to do the assassination part, as long as you are willing to throw Ukraine under the bus. Conversely, even if the assassination scheme goes exactly as planned, there is no way of guaranteeing that the new Russian leader would be willing to restart gas deliveries until the war in Ukraine has wrapped up. Given that especially the eastern EU countries have absolutely no intention of allowing Ukraine to lose, this seems like a very tall order.
Finally, both Nordstream 1 AND Nordstream 2 still have a gaping holes in them from the bombings so restarting deliveries will probably take several years at least.
All in all, this plan gets only a 2 out of 10 for being impractical, too slow AND depending on factors outside our control. 1 point because it does at least sound spy-ish and proactive.
The problem for Europe is that they have nothing to trade with Russia. They can get better prices elsewhere.
Before 2022 we had the big EU auto companies in Russia, we also had nice handbags, shoes and outfits to sell to Russia. Plus we could have them hide their money in London property. Machine tools were also a brisk trade.
Nowadays Russia needs nothing from Europe. Nothing apart from peace and their 300 billion back. But we have gone past that stage. The Russians have never broken any energy contracts in this, the West has cut themselves off.
Regarding the EU not wanting the former Ukraine to lose, there is a difference between what the officials want and what the people want. From Finland to Portugal I am sure most people would want no war and cheap energy, however, their 'leaders' are just doing what Washington tells them to do.
Huh? Even in the US the majority are sympathetic to Ukraine in every survey. Sure we all want no war - but we are not really in favor of no war at any price.
> You could do this whole plan without needing to do the assassination part
Not really. Putin will not deal with Europe honestly.