because he is an avowed Zionist who a) wants to drive all Arabs out of Palestine, and b) to at least use conflict to stay out of prison for corruption...and Vladimir for shifting U.S. military aid from Ukraine's defense to the Iranian offensive (see linked article "Why Russia is Watching Iran Burn")
Trump's deepest thoughts are for Big Macs and Golden Toilets...that's it.
Link: https://www.foreignaffairs.com/russia/why-russia-watching-iran-burn