"Wow! What a message. What a hero," one person wrote on Twitter.
"Very courageous lady! Congratulations on making it, literally, to the top of the world... you are an inspiration. Thank you as well, for your support of Ukraine," another Twitter user wrote.
"May God bless this wonderful Russian women, for scaling Mount Everest and unfurling the Ukrainian flag in protest at the Russian war in Ukraine. Putin needs stopped by whatever means necessary, to prevent mass extermination of Ukrainian's [sic] or the world will suffer," someone else wrote.
The climber also posted a photo of herself on the mountain with a sign that said "Free Navalny", in support of Alexei Navalny, anti-corruption activist and one of Vladimir Putin's enemies.