He is also ethically impaired.

I thought Trump was dead. Guess he’s not anymore

It is not in the interest of the US that this war finishes.

It’s important to dstinguish the interest of the US from the interest of Donald Trump and his traitorous junta.

It is not in Trump’s interest that the war ends without a Russian victory, since Trump is a Russian stooge who was put in office by Putin to deliver the victory that Russia has not been able to achieve by force of arms. Trump doesn’t want to be seen to be backstabbing Ukraine, so instead he has resorted to lip service not backed with any concrete measures that might change the balance of power in the conflict.

raised income via defence and energy contracts (incl. Oil & Gas)

US arms sales attributable to the Ukrainian conflict are relatively small part of the US’s entire defense market (which is vastly bloated and which has been used over several decades to achieve military Keynesianism).

A strong demand for oil and gas benefits Russia proportionately far more than it does the US, since fossil fuel exports are a far larger percentage of Russian export earnings. What else do they make that anyone wants? Vodka and caviar? Spyware-riddled antiviros software?

prolonged economic disadvantage to a competitor nation via sanctions

The only reason the sanctions are damaging to Russia is that Russia continues its aggression towards Ukraine and threats towards the non-Russian-vassal states in Europe. And the US is far from the only nation sanctioning Russia. And “competitor” in what, exactly?

The proxy war in Ukraine strengthens China, India, North korea. China gets the chance to ramp up its military production capacity even more while Russia pays for it. North Korea gains military know-how… submarines, rockets, drones. India gets cheap gas.
Ok, Syria’s regime collapsed, but the country isn’t stable at all.

Europe is forced to arm itself or so they say. The result is a diminishing influence of the US on Europe. The broken promise to protect Ukraine if they give up their nukes reduces the trust in the US. The US diplomacy doesn’t look exactly coherent - Russia has not much reason to take the US seriously atm.

Russia’s autocracy is stabilized by the war. It’s war against Ukraine didn’t hurt Russia too much, it even gained something. A message to other countries with ambitions to try it themselves. Canada, Greenland and Taiwan are on the menu I heard.

And: Resources are wasted. Environment and climate are damaged. People die.

Not sure if the advantages outweigh the negative aspects or if it is more about domestic political opportunism and cleptocracy/ personal gain. Inexperiencie and shortsightedness too, maybe.