Timeout real quick. Did you read the article or just the headline? First off given that this is an opinion and not a news article. Second that if you actually read the news articles, not the opinions you'd quickly see the difference. Let me link to the article sourced in your article.
https://www.cnn.com/2018/05/04/politics/robert-mueller-ukraine/index.html
"Ukrainian investigators had been tracing money paid to Paul Manafort, who would later become Trump's campaign chairman, by figures in the political party of pro-Russian Ukrainian President Viktor Yanukovych, the Times reported. Yanukovych was ousted from power in 2014. The decision to halt the investigations came at a delicate moment for Ukraine, as the Trump administration was finalizing plans to sell it anti-tank missiles called Javelins, the Times reported."
So basically you're attempting to compare Democratic Senators saying, don't worry about Trump stopping from selling you weapons, we'll still back you. To the whitehouse freezing 400M in military assistance appropriated by Congress. I mean even if Trump (more specifically Giuliani) didn't withhold the assets because of this scenario unfolding, this just further makes him look in bed with Putin as he wants the Ukraine back under russian control.
