I think it's more likely that Trump was more concerned over Putin's nuclear threat and the chemical attack in Syria than he was with Ukraine cooperating with the Mueller investigation....
"...Behind the scenes, however, Trump has recently taken a sharper tone on Putin, administration officials said, but the shift seems more a reaction to the Russian leader challenging the president's strength than a new belief that he's an adversary. Putin's claim earlier this month that Russia has new nuclear-capable weapons that could hit the U.S., a threat he underscored with video simulating an attack, "really got under the president's skin," one official said.
So much so that after hearing Putin’s speech, Trump called the leaders of France, Germany and the U.K. to say the Russian leader sounded dangerous, so the four of them needed to stick together, according to a White House official familiar with the calls...
Two officials said Trump told Putin during a phone call last week after Putin's re-election: "If you want to have an arms race we can do that, but I'll win."
Last week, as the president's national security team finalized options for a response to the Russian nerve agent attack in the U.K., Trump voiced a now-familiar complaint....
Rex Tillerson, Trump's outgoing secretary of state, led the effort to convince Trump to approve the new arms for Ukraine, officials said. The plan, which Russia opposed, included the sale of U.S.-made Javelin anti-tank missiles that Kiev has for years requested from Washington...."Tillerson just wore him down," a White House official said...."
https://www.nbcnews.com/politics/do...lk-publicly-about-russia-policy-moves-n861256
opcorn2:
