I have a very shiny tinfoil hat to don here. Part of me thinks this is Trump giving Putin what he expressly wants.
By all accounts, Putin is striving for a return to the Old World Order, in which Great Powers wielded influence and cut deals to divvy up the world. What better way to start down that path then by feigning a proxy war with the US? Far from being the beginning of a falling out with Russia, I think this shows a level of coordination that we've not yet encountered.
My aversion to conspiracy theories makes me hate myself for even saying this, but my track record of being incorrect on all things Trump gives me some comfort.