Recurring pro-Kremlin disinformation about abandoned Ukraine, also presenting the country as Nazi/Fascist.
It is speculative and misleading to compare the situation in Afghanistan and Ukraine. There are no US military forces deployed on the territory of Ukraine. The relations between Washington and Kiyv are based on mutual respect and cooperation. As it is officially noted: “U.S. policy is centered on supporting Ukraine in the face of continued Russian aggression as it advances reforms to strengthen democratic institutions, fight corruption, and promote conditions for economic growth and competition.”
Regarding the myth of Nazi-ruled Ukraine (or the imminent rule of Nazis in Ukraine): this has been a cornerstone of Russian disinformation since the very beginning of the 2013-14 Euromaidan protests in Ukraine, when it was used to discredit the pro-European popular uprising in Kyiv and, subsequently, the broader pro-Western shift in Ukraine's foreign policy.
In fact, Nazi and Communist ideologies were banned by Ukrainian law in 2015. Far-right groups had a very limited presence during the protests and went on to obtain abysmal results in the 2014 presidential and parliamentary elections. The 2019 election cycle demonstrated that the far-right enjoy only marginal popular support. The far-right sustained a tremendous failure; the highest-rated nationalist candidate, Ruslan Koshulynskyy, only won 1.62% of the vote whereas Svoboda won 2.16% of the national vote, falling far short of the 5% minimum threshold of votes for entry into parliament.
See earlier related disinformation claims, alleging that US protégés in Ukraine will have to flee like Ashraf Ghani; and that US should leave Ukraine as it did with Afghanistan.