That would assume they are willing to break their contract and not returning the machines. Which they can do, but then they will never be able to lease a machine again. At best, this buys them a couple of months of operations.

You underestimate the shortsightedness and short memories of businessmen when shown a pile of cash, especially at companies like Boeing and other defense manufacturers.

The businessmen might think of their wallets first, but as long as the sanctions last, they cannot send spare parts to Russia. Also, the defense manufacturers are currently quite happy with the increased defense spendings.

Whatever the US role in the events in Ukraine was, for sure they won't let Russia off the hook easily after this invasion.