Russia failed to achieve its primary strategic goals. It has even failed its secondary strategic goals like taking the Donbas.
Instead of a swift conquest of Ukraine, they’re stuck in essentially a stalemate in most of the regions they control. They’re also facing an imminent counter offensive in the south with Kherson (their primary prize claimed so far) increasing cut from the lines of communication.
Meanwhile, years of economic growth have been erased from the Russian economy, it’s diplomatically isolated, militarily discredited, and facing a reinvigorated and enlarged NATO.
I’d call that a strategic failure.