A transaction is a two-way process, an exchange where a party agrees to do a thing in return for another party agreeing to do a thing.
To use old-style language, a transaction is a bargain, an exchange of promises.
And for the business people concerned in a commercial transaction, that contract has sanctity. So if a party does not comply or even breaches the contract there are remedies which are intended to place the injured party in the position they would have been had the agreement been properly performed. Often these are “money” remedies, but sometimes they can be injunctions or other court orders.
The court will enforce what the parties had agreed, for the agreement is the thing.
But for Trump, the agreement is not the thing.
An agreement is there to be opportunistically repudiated, and not to be performed.
An agreement offers an opportunity to gain leverage, for a new negotiation. for a new exertion of power.