Ukraine decided to stop collaborating with the Mueller investigation. This is a decision that will hinder Ukraine’s own internal anti-corruption efforts but the investigation produced zero results so far and dragging it out to undermine the administration that has been very favorable to Ukraine and aggressive towards Russia seems suicidal.
Ukraine has tried to facilitate Mueller’s investigation for a while but it is continuing into infinity and looks quite pointless at this time. And Ukraine can’t afford to die just to entertain Americans and boost Rachel Maddow’s ratings.
Clarissa's Blog 
From several sites, it appears more likely that the Ukraine government dropped the assistance, and an investigation into Paul Manafort, in order to get approval for a weapons purchase from the US government.
LikeLike
The weapons have been in Ukraine for a while.
LikeLike