U.S. President Donald Trump said he will speak with Russian President Vladimir Putin on Tuesday to discuss ending the war in Ukraine, according to CNBC. Trump is seeking Putin’s support for a 30-day ceasefire that Ukraine accepted last week. The Kremlin has expressed "cautious optimism" but has yet to formally respond. Secretary of State Marco Rubio and other officials noted that challenges remain before Russia agrees to a truce. Ukraine’s President Volodymyr Zelenskiy insists that sovereignty is non-negotiable. Russia demands NATO exclude Ukraine and grant security guarantees in any peace deal.