Why could there not be a ceasefire in Russia-Ukraine? The matter deteriorated due to the demand of these countries

In the second round meeting held at the White House, no solution was found about the ceasefire. The conditions of President Putin are clear that Ukraine cannot be a part of NATO, foreign forces and missiles cannot be deployed on Russia’s border, and the area that Russia has will not leave it. Leaders of Ukraine and Europe want a security guarantee like Neto’s article five.