Definitely almost 100% of the native-Ukrainian speakers but I don’t think it is true at all that all the Ukrainian native Russian-speakers support Putin. Zelensky himself is a native-Russian speaker and I’ve read lots of reports of native-Russian speakers being extremely upset at the invasion. Also at least half of eastern Ukraine voted for Zelensky for president. And of course obviously many Russian speakers realize it is much better to be connected to a prosperous and free Europe despite any problems it has than to a Russian dictatorship. There are definitely ethnic Russians that identify with Russia first but I can’t estimate the numbers except to say it is not 100%.