As Putin’s domestic and foreign policy failures mount, he is likely to become increasingly desperate. No one should be surprised if he engages in more terrorist acts.
The problem is that Russia can still trade with China
And, there is a matter of using front companies in Belarus and Kazakhstan. If the US and EU were smart, we would go after those governments as well for their support of the Russian Regime by slapping the same sanctions on them. We also need to get tough against China, including threatening and implementing sanctions on them if they don’t boycott Russia.
And, finally, the EU/US sanctions do not hit hard enough. They needed to put “State sponsor of terrorism” level sanctions on Russia and its puppet states to have any impact, and also threaten China with similar sanctions if they do not cut off Russia. This includes banning travel to those states.