Why do Ukrainians feel a sense of betrayal regarding US-Russia negotiations?

Ukrainians feel betrayed because the US and Russia held talks in Riyadh without Ukraine's involvement, despite the discussions directly concerning Ukraine's future. The Ukrainian position has consistently been that any talks about Ukraine without Ukraine's participation are unacceptable. This sense of betrayal is compounded by dwindling resources - with reduced flow of money and arms compared to the Biden administration era. The situation creates anxiety as Ukrainians fear a deal might be struck between the US and Russia that would go against Ukraine's constitution, which clearly defines the country's borders. Any agreement that doesn't restore Ukraine's pre-February 24, 2022 territories would be viewed as a loss by the Ukrainian public, something they are not prepared to accept.