Yes the biggest problem for Russia is not enough PGMs.
They don't have enough of a stockpile or production capacity to use them freely as they want.
It'll be a real problem for any military engaged in high intensity conflict. Even the United States will run out in a month.
Throwing a few a day at insurgents is one thing, using hundreds a day, you'll run out quickly and switch to unguided munitions.
The Russians do not need to use guided munitions for stationary targets of small value, it would be enough to use the unguided munitions that the Russians manage to have a CEP a little higher than the performance of a guided munition, this would not affect the performance of the Russian air force so much. It's a system they put on fighter jets and that system is being used in Syria to give unguided munitions improved accuracy.
I'm sure the stockpile of unguided munitions is large enough to attack low value targets in Ukraine, leaving the use of guided munitions for higher value targets. So far, it appears that the Su-34 aircraft are on the ground and have not taken off from their forward base in Voronezh at any point in the 24 hours. Not to mention that in this same base, the 10 of the 18 Su-24s that were from the Crimean base are also positioned next to the Su-34s.