More specifics on what can be done — https://noahpinion.substack.com/p/the-long-economic-war-against-russia on economics, https://ecfr.eu/article/how-western-offensive-weapons-can-help-ukraine-defeat-russia/ on weapons.

There are always some escalation risks, but taking more steps doesn't mean starting World War III. I understand that a no-fly zone isn't realistic, for example, but there are a lot of measures that can & should still be taken.