What are the potential consequences if Putin fails to engage in sincere peace negotiations regarding Ukraine?

US Vice President JD Vance has outlined serious consequences should President Putin refuse to negotiate a Ukraine peace deal in good faith. Washington is prepared to escalate its response through two primary measures: imposing significantly tougher economic sanctions on Moscow and potentially deploying US troops to Ukraine. This ultimatum represents a substantial escalation in US foreign policy toward the Russia-Ukraine conflict. The threat of direct military involvement marks a potential shift from the current strategy of providing weapons and financial support to Ukraine toward more direct American engagement. Additionally, Vance emphasized the importance of European participation in any Ukraine peace talks, highlighting the need for a coordinated Western approach to resolving the conflict and ensuring regional stability.