What negotiation principle from 'The Art of the Deal' is being discussed in relation to Ukraine war negotiations?

According to Nancy Cordes, 'The Art of the Deal' emphasizes entering negotiations with the strongest hand possible and not giving away leverage before talks even begin. This principle is relevant to concerns about U.S. officials prematurely conceding Ukraine's NATO membership prospects or territorial integrity in potential peace talks with Russia. The traditional negotiation approach would advocate maintaining these bargaining chips rather than surrendering them before formal discussions start, which has caused great concern for Ukrainians who fear losing key territorial and security guarantees in advance of actual negotiations.