Ukrainian President Volodymyr Zelensky and Donald Trump shake hands during a meeting in September 2024 in New York City.Alex Kent/Getty ImagesPresident-elect Trump said he can bring peace to Ukraine.But a deal is unlikely to last unless Ukraine gets security guarantees.It's unclear what, if any, guarantees Trump would back.In the wake of Donald Trump's election victory, momentum is building behind the president-elect's pledge to end Russia's two-year war in Ukraine once he takes office.Russian President Vladimir Putin this week indicated he's willing to take part in negotiations.Ukraine's President Volodymyr Zelenskyy is also sounding more receptive to talks.