A lot of analysts and reports have pointed out their financial struggles and shady practices. It's worth digging into their recent earnings calls if you want to see the red flags.
The 🥭's position is whatever his dementia-addled min can retain of what Putin told him orders were. These sanctions now are because Thune was set to roll out a whole lot of really nasty new sanctions including taking frozen Russian state assets and giving them to Ukraine.
The admin's new sanctions are the least they could get away with to make Thune hold back, and in practice is a signal to Putin that he's still a loyal lapdog as much as he can get away with.