During a press conference with his Ukrainian counterpart in Kyiv, US Secretary of State Antony Blinken says that Russia's "central demand is not clear" and that some of its proposals in exchange for deescalation at the Ukrainian border "are clearly absolute non-starters like closing NATO's door to new members." Moscow insists it has no plans to invade Ukraine, but is demanding wide-ranging security guarantees -- including a ban on Ukraine ever joining NATO. IMAGES AND SOUNDBITES