Think about the Trump Tower meeting in 2016 in terms of Ukraine today
Remember the Trump Tower meeting back in June of 2016? The Trumps were lured into hosting the meeting with the promise of dirt on Hillary. But, for Putin it was really about undoing the Magnitsky Act. We know this because in their coverup story the Trumps claimed the meeting was about "adoptions". Obviously Trump and his kids had no idea how restrictions on adoptions were related to the Magnitsky Act, otherwise they would have known what Putin was actually up to and wouldn't have used such a telling alibi.
With the current situation in Ukraine we need the Magnitsky Act more than ever because it allows for the targeted personal sanctions against Russian Oligarchs. Putin hates Magnitsky Act, because if used correctly, it could be one of the strongest things we have when it comes to punishing Putin for what he is doing.
Fortunately, getting rid of the Magnitsky Act was one of those things Trump could not do for Putin. However, through ignorance and a desire to get dirt on Hillary, Trump never alerted our intelligence that Putin was trying to influence a possible future president. It's just another example of how Trump has covered for Putin.
Discussion on the Magnitsky Act starts at Approximately :22 of the video.