As I said in my opening remarks, sanctions don't stop wars. Historically, if we go by the analysis of recent sanctions regimes in the 20th century, we shouldn't expect the sanctions against Russia to end the war. However, we can expect that the economic issues they cause for Russia will be severe enough that Russia will want to come to the table and get out of this war.
As to whether the sanctions are effective, we've clearly seen that they have had an impact, especially on the military industrial complex. Right now in Ukraine, Russia is being forced to use Soviet weapons. It has to blow the dust off weapons and old tanks from the USSR era. The same thing goes for its air force. So, are the sanctions working? Yes. They are depriving Russia of goods and the parts it needs to expand its military industrial complex.