What is Ukraine's stance on security guarantees and how are European leaders responding?

Kyiv is firmly rejecting conditions that would leave Ukraine vulnerable, warning that without proper security guarantees, Russia could launch another invasion. This concern is shared by European leaders, particularly British officials who have expressed readiness to commit ground forces alongside others if a lasting peace agreement is reached. However, British leadership emphasizes that a US backstop is essential, stating that American security guarantees are 'the only way to effectively deter Russia from attacking Ukraine again.' This position underscores the widespread belief that despite European willingness to contribute militarily, US involvement remains critical for credible deterrence against future Russian aggression.