To be fair, that they are struggling to take over a couple of villages in Ukraine is in large parts due to the intensified arms and ammunition production of the entire EU (and in the past that of the US). And that's only enough for a standstill
That is fair to say today, but not when the war began.
Afaik this really isn't true. Most of the drone parts used both by Russia and Ukraine are coming from China, or Soviet surplus.
It used to be much more true. The Biden admin sent a lot more US weapons to fight Russia, Trump used to be much more amenable to send similar weapons provided somebody paid for it.
Nowadays US materiel is either tied up in the middle east or somewhere else (Patriots), or has been neutralized by Russian EW (HIMARS), or the US is just unwilling to part with it for whatever justification.
Standstill with Ukraine looks bad, and authoritarian regimes can survive almost anything except looking bad.
Responding to a NATO “attack” from Estonia, Putin can pivot to a bigger enemy where of course Russia has to employ universal conscription / nuclear weapons / whatever. The country must unite against this unprovoked western attack, etc, etc.
Ukraine did a spectacular job to stop the full-scale invasion in the initial hours, days and weeks when there wasn't much international help yet though (and I guess from that moment on the war didn't go quite according to plan from the Russian PoV).