I do not claim Americans are ignorant — I was asking a question anyway, so not claiming anything.
I believe that, by publishing such a basic article, The Washington Post is claiming Americans are ignorant. I am trying to understand that particular phenomenon: why would a respectable newspaper, made for educated people, publish an article intended to the ignorant?
"2. The article explains a situation by giving a basic history lesson, and does not contain any new or exclusive information."
Doesn't hold in my opinion. The article is more than "basic" for anybody not following Ukraine permanently.
Still can I agree with you if you consider the article tone a bit insulting to the reader. I find it a strange etiquette, openly writing to the reader as he's "too simple." But I believe enough readers consider it a joke, exactly on the topic "most Americans don't know anything about the World."
The "strange etiquette" you mention is exactly what I was referring to. Except that, to me, it did not feel like a joke, so I wanted to be sure — I am probably not enough used to some aspects of American culture.
"No one in this world, so far as I know — and I have researched the records for years, and employed agents to help me — has ever lost money by underestimating the intelligence of the great masses of the plain people. Nor has anyone ever lost public office thereby."
H. L. Mencken, "Notes on Journalism"
Personally, I think that this rule being taken seriously has done more damage for US culture than just about anything else.
And in the service of serving the audience, providing some background in an approachable listicle format is quite useful. Especially considering that many readers probably know that Ukraine is in the midst of turmoil, but they may not understand the root causes.