Russia has taken Crimea. Ukraine should send Russia the bill for their illegal taking of Ukrainian property.
Ukraine owes a lot of money. Why can't Ukraine send Russia the bill for taking Crimea. Just what is the net worth of all that property, including the naval base at Sevastopol?
The real and personal property should be calculated at fair market value, of course. And mineral rights have a value. Add it all in.
Then Ukraine could subtract from that bill what Ukraine owes Russia, as partial payment on the bill.
And then use future Russian payments as collateral for IMF loans to help restructure Ukraine's economy.
Heck, begin proceedings on sanctioned Russian individuals and apply that seized wealth to the bill.
That could be a good sum of money to wipe out Ukraine's debt to Russia, at least, and leave Russia owing Ukraine a whole lot of money in the end.
If you break it, you own it, right? Send Putin the bill for it.
UPDATE: Upon reflection, two days later, I'd make it monthly rent instead of a bill for purchase. I suppose we wouldn't want to imply that the loss is permanent.
Ukraine could start nationalizing Russian property in Ukraine for first and last month's rent plus a security deposit. And keep nationalizing more as rent payments come due (and aren't paid).