According to Podolyak, one of the reasons is that Russia is attacking its own cities.

Mikhail Podolyak, adviser to the head of the President’s Office, provided four explanations for the bombings in Russian front-line cities.
As Podolyak noted in Telegram, there is no logic in the actions of the Russian command.
“The war is live. Therefore, everything can be seen online. And we really have already seen how Russian missiles return to their place of departure with a boomerang. We know the real value of statements about the “high-precision” of Russian weapons – Kyiv, Kremenchug, Odessa, only the latest examples … And we perfectly understand the logic of the actions of the Russian command (more precisely, its absence),” he said.
According to him, one of the reasons is that Russia is attacking its own cities.
“First: attacking their cities (when did the Russians feel sorry for their compatriots?) with their own missiles as a provocation to accuse Ukraine of shelling Russian cities and disrupting the supply of Western weapons. Primitive, but absolutely in the style of modern Russian idiotic propaganda,” he said.
Also, the clumsiness of the Russian military may be the reason for attacks along the border.
“Second, the “intellectual” operators of Russian air defense systems are clearly growing hands from places where normal people have other body parts. Therefore, everything starts to burn,” Podolyak said.
The adviser to the chairman of the OPU also noted: “Third : obligatory karma. Mariupol, Kremenchug, Sergeevka, Chortkov, Kharkiv, Bucha, Severodonetsk – evil always has consequences. And you always have to pay the bills … Fourth: God’s Providence Because you can’t be such deceitful hellish devils…”.
He also added: “The only thing I don’t understand is why not Voronezh, because if according to plan, then according to plan.”
Podolyak noted that not only the actions of the Russian army are contrary to common sense, but this entire war is contrary to common sense.
“Because the modern Russian Federation is not about common sense at all,” he wrote.
(C)UNIAN 2022

The truth is that there is no truth when mafia land says something. And, anything is possible in mafia land, even such a ludicrous move as bombing its own cities. After all, if the West were to believe such a measure and get upset with Ukraine for attacking mafia land (as bizarre as it sounds) there is a real possibility that weapons and ammo will stop being send.
Having said that, Ukraine has every right to attack mafia land itself, and even if civilian targets are hit, this should never be an issue, seeing the horrors committed by mafia land since the start of their unjustified war.