I think the United States decided to kill Europe in order to save its economy from the inevitable crisis and get rid of a strong competitor, but Russia, in principle, is not against it, it just has its own interests.
Exactly.
Decades ago when Europeans figured out that US had lied and the pieces of paper they kept printing wasn't backed by gold, they dumped USD and its value got halved in 6 months. But US policy makers were quick about replacing gold with oil which is when Petrodollar was created and that let them keep printing that worthless piece of paper even more but "export" the resulting inflation to Europe and elsewhere.
Today a lot of oil and gas rich countries that control a large amount of the world's supply among them (Iran, Russia, Venezuela and to some extent Iraq and Saudi) alongside the biggest consumers like China and India and other BRICS members are dumping USD and replacing it with a new currency.
This means trillions of dollars are already going back to US dumping its value and increasing dollar inflation.
In order for US to survive they have to try and keep Petrodollar alive which is why Europe is ordered to continue using it and not have any good relations with the Eastern bloc like coming to terms with Russia or for example fixing the relations with Iran that could flood the market with at least 2 million barrels of oil per day decreasing its price to below $40 and save EU's economy.
Of course I should mention that it's already too late for EU to change since they've played as US colonies for too long and now they are under Iran's sanctions which is why when the European Union diplomat Mora comes to Iran begging for gas and oil, he receives the middle finger.
The only thing I'd be worried about these days is how long before we start seeing more Brexits (essentially European Union falling apart as more countries leave it) and for Europe to go back to pre WWII era when each of those little countries were at war with each other every day.