US Secretary of State Marco Rubio (R) and Ukraine's Presidential Office Chief of Staff Andriy Yermak hold a press conference following talks in Geneva on November 23. Fabrice Coffrini/AFP/Getty Images Geneva —

America’s top diplomat struck a relentlessly upbeat tone in Geneva, after a rollercoaster day of intensive negotiations aimed at convincing a skeptical Ukraine to accept the latest US proposals to end Russia’s brutal war.

“I feel very optimistic that we can get something done here, because we made a tremendous amount of progress,” the US Secretary of State, Marco Rubio, told me at a late-night news conference at the US Mission in the Swiss city.

Even President Donald Trump, who just hours earlier had again publicly scolded the Ukrainian leadership for expressing what he

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