The Navalny family intends to take the case as far as the Constitutional Court, the politician said on Monday in a post on his official Instagram page, which is run by his lawyers and allies.
Experts argue that the stark deviation from Putin's usual behavior and security protocols points to the involvement of a body double.
Russian General Sergei Surovikin reportedly has been detained after an abortive armed mutiny by mercenaries on Saturday.
Vladislav Surkov, once known as the Kremlin’s ‘puppet master’ by friends and foes alike, said "private military companies" were an idea imported from the US, created to engage in proxy wars.
Wagner militia chief takes feud with top brass to new level, Prigozhin earlier accused army of deceiving Putin over Ukraine
The Middle East economic powerhouse has sought to maintain what it says is a neutral position on the Ukraine war.
Anatoly Maslov, 76, is one of three hypersonic missile scientists who worked at an institute in Novosibirsk and who are now facing what the Kremlin has said are "very serious accusations."
Vadym Skibitsky, deputy head of Ukraine's military intelligence service, told Germany's Die Welt newspaper that Kyiv wanted to assassinate Putin.
Two women, a journalist and a director of an anti-Kremlin NGO, reported symptoms that suggested possible poisoning.
Dmitry Peskov: "We take an extremely negative view of this. Britain is trying to be one of the leading countries which keeps pumping weapons into Ukraine."