??? Ukraine could do a lot right now to collapse the Russian economy. Blowing up the gas pipelines transporting Russian gas over Ukrainian territory would be a start.
Targeting Russian oil pipelines and tankers would also go a long way to reaching that target, not to mention going after ALL Russian oil fields and oil infrastructure with targeted drone attacks.
Of Course, the rest of Europe would scream bloody murder at the Ukranians 'cuz they are already short of sufficient natural gas *even with greatly increased US LNG exports to EU* and significant reductions (4-5 mil bopd out of the 10 mil bopd that Russia produces in oil would drive world oil prices sky high.

Finally, brethren, whatsoever things are true, whatsoever things are honest, whatsoever things are just, whatsoever things are pure, whatsoever things are lovely, whatsoever things are of good ...