actually, most countries that got sanctioned like russia did and also took the military setbacks russia would have quit or had a capitualationist coup already.
Russia hasn’t been in any major war in its entire history where it managed to do well at the beginning.
It usually starts by suffering more casualties in the first phase than its enemy will suffer during the entire war, then slowly claw its way back, in the end russia would win, but suffering several times more losses than the enemy russia eventually beat.
Historically, no matter how impressive the russian military looks on the surface in peace time, the first exposure to serious combat always shows the actual combat power of Russian military have fallen far behind those of other leading military power over any lengthy period of peace. Some times the Russians never recover during that war, sometimes the russians recover at great cost and suffering, ultimately producing an effective and massive fighting force by the end of the war, only to have the fighting force continue to look good on the outside, but hollowed out in skill and capability on the inside, compare to others, over any long period of peace that follows.
This war just shows the russians still have not broken this historic habit.