Let me see if I can summarize here...
Pres Putin wants Ukraine back in the Russian orbit, he wants that very strongly. To the extent of continuing a war with Ukraine, even after annexing part of Ukraine.
Ukraine wants Democracy, so Ukraine looks to the United States for help fighting Russia.
Putin wants to assure such overtures from Ukraine to the US are not successful, so he works to assure candidate Trump's installation into the Oval Office.
The tactics used include getting Mr Manafort installed as a campaign manager just before the Republican convention, and having Mr Manafort change the Republican platform regarding Ukraine.
Russia also used Mr Manafort to deflect the blame for the Russian DNC hack by havng him plant the idea that it was Ukraine, not Russia, that hacked the DNC. (Russian Intelligence operative Mr Kilimnik probably thought Mr Manafort would be the useful idiot for this task, and whispered sweet nothings in his ear.)
Once the idea was planted, it grew quickly within the conspiracy-fertilizing alt-right and eventually took root in Pres Trump's consciousness.
Now, Pres Trump is looking to get the server back from Ukraine even though, (1) Ukraine doesn't have it and, (2) the FBI had already imaged the discs of the server so there was really no need to get the actual server.
Because of the above, Pres Trump does not like Ukraine, a sentiment that has been carefully cultivated and nurtured by Mr Giuliani (at this point, I am not sure who is paying him to preform this work).
So, instead of helping Ukraine fight for Democracy, Pres Trump decides to use Ukraine for his political purposes, e.g., getting dirt on a political opponent.
And here we are.
How'd I do?