Sanctions send a clear message to Putin and the perpetrators of his illegal war: Russia will be held accountable for its actions and its economy will not be allowed to grow as long as it continues to fundamentally threaten democracy through this brutal invasion.
Almost two months after the US and its allies weaponized the financial system to impose the harshest ever sanctions on Russia, the invasion is still continuing and the Russian ruble is up against the US dollar compared to pre-war levels. Although some economic sanctions are yet to bite the Russian economy, the efficacy of this strategy may need reevaluating.
It's hypocritical to impose sanctions on Russia for invading Ukraine, but not on the US for invading Iraq for equally unjustified reasons, or on Israel for invading and annexing Arab lands.