The West is erroneously acting from a viewpoint that the majority of Russians support democracy. Thus they think that actions like this will cause popular discontent with Putin. In reality, this reckless action will only strengthen Putin's support.
> West is erroneously acting from a viewpoint that the majority of Russians support democracy.
Sanctions have nothing to do beliefs about the presence or support for democracy.
> Thus they think that actions like this will cause popular discontent with Putin.
No, the West believes that the sanctions limit the productive capacity of the Russian economy, and thereby Putin’s capacity to maintain and expand the war, constraining his practical options
(They also think that targeted sanctions on oligarchs put pressure on their support of the regime, which may alter Putin’s choices and prospects, but that even more clearly has nothing to do with democracy.)
The Russian military has been extremely insular, and has insisted for a long time to produce everything they need domestically. It is unlikely Russia's warmaking potential will be halted long-term.