Of course there are other reasons why Ukrainians are outraged apart from the fact that US just demanded they give up their territory; things like the fact that US is throwing a red carpet to receive the invader of their country who also has an arrest warrant out issued by Western organizations (the international court thing). Something the US regime doesn't care about at all.
Things such as the fact that simultaneously the US regime is demanding that Ukraine give up its natural resources to US (the mineral deal thing) which is also another indication of how desperate US is economically after the tariff war they started specifically with China (that controls global supply of some of those minerals).
Ukraine is becoming the biggest loser. They lost thousands of young soldiers and civilians. They were forced to sign a deal giving out some expensive, rare earth minerals. The invader and their main supporter are discussing the terms of peace without them. From the look of things, they might lose some part of their territory.
The US's desperation to acquire lithium, graphite, manganese, titanium and others was because China has established itself as a major player in the rare earth mineral industry. Australia and Chile might be the major producers of lithium but China controls the market. Thereby giving them an edge in the global lithium battery sector.
This should be a lesson to nations that depend on others to fight wars.