What are the limitations of US support for Ukraine as outlined by Secretary of Defense Pete Hegseth?

According to Secretary of Defense Pete Hegseth, the US has established clear boundaries on its support for Ukraine. Specifically, the US does not support NATO membership for Ukraine and will not contribute any troops to a peacekeeping force in the country. Additionally, the US believes that returning Ukraine to its pre-2014 borders (before Putin's first invasion) is unrealistic. These stated limitations have faced significant criticism, with many viewing them as prematurely surrendering US leverage to Russia before negotiations have even begun. Critics argue this approach weakens Ukraine's position in potential peace talks while strengthening Russia's hand in diplomatic discussions.