Actually, he isn't losing at all and what is more he never wanted to take over Western Ukraine in the first place he is after the Donbass and East Ukraine area which he is still in full attack mode.
Russia Indicates Withdrawal in Position From Ukraine Capital, Kyiv
March 29, 2022 | Sundance
Excerpt:
While the western propaganda about the Russian objective in Ukraine remains at a fever pitch, most intellectually honest observers have always held that liberation of eastern Ukraine was the goal of Russia and western Ukraine was never part of the objective.
With a decade-long civil war in eastern Ukraine preceding the current Russian operations, and with western forces supporting one side while Russia supported the other, it was always presumed -prior to the Russian military operations- that Vladimir Putin’s central goal was be removing NATO influence from eastern Ukraine.
LINK and chart
You haven’t posted evidence. You’ve posted obviously biased theory/propaganda to justify Putin’s failure.