I don't really get how you can even
begin to trust anything that Putin promises or signs.
Russia has a long tradition of treating treaties as scraps of paper, and they have a recent history in this regard with Ukraine.
Their long-term aim is to absorb Ukraine and exploit its industrial and agricultural potential for further imperial expansion. The next will be the Baltic countries and after them Central Europe.
Whatever peace will be signed now will last precisely as long as it takes Russia to rebuild their offensive capabilities for the next round of war.
All the dead are fault of Putin and his imperial ambitions. Our only choice is whether to submit and become serfs in a neo-Russian empire, or fight back and help Ukrainians fight back.