Any (mostly based on the chapter 280). I am not Russian of any kind but I am fluent in this language.
The chapter 280 in your linked text offers the punishment for the public discreditation of the usage of the Armed Forces of Russian Federation for the goal of defending the interests of Russian Federation and its citizens. It does not include the requirement that the "discreditation" should be based on knowingly or unknowingly the wrong information. The person would be guilty also for telling the known and verified truth, if this truth may cause people to stop respecting someone or believing in an idea or person. Nothing else is as discrediting as the truth may be.
The existence of this chapter probably explains why in some cases even displaying a blank poster with no text can be punishable (source) so really remains a question if anything can be legally said apart copy-pasted official new releases. Attorneys cannot speak for they defendant if this defendant is an anti-war protester. Deputies cannot do they job by raising doubts if the Ukraine campaign is managed well.
Using the word "war" is seen as discreditation so falls under this chapter as well. This is the "special operation". Russian opposition politician Yevgeny Roizman, has been arrested for the single phrase, 'the invasion of Ukraine'. Due that I write "any", as once you use the word "war" that is in the title of the question the deal is done.
The chapter 207 in the linked text talks about the public distribution of the knowingly wrong information, related to the usage of the Armed Forces of Russian Federation for the goal of defending the interests of Russian Federation and its citizens. The honesty of this chapter depends on how much is required to prove that the information is not just wrong but knowingly wrong. I am under impression that everything not in official news is automatically seen as "knowingly wrong". Statements like "Ukraine and its allies, including London, are threatening Russia for the last 1,000 years, to move NATO to our borders" (source) may theoretically also qualify. But likely would be assumed that the Russian propagandist sincerely believed NATO is the whole millennium old (only founded in 1949).
The chapter 284 talks about the suggestions for sanctions and other restrictions for Russian Federation and its citizens. While Russian Federation itself is kind of strange place to call for sanctions on it, the most extreme opponents of war may possibly go that far.