Geneva (CNN) — 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 regarded as insufficient gratitude, was now “quite pleased at the reports we’ve given him about the amount of progress that’s been made,” Rubio added.

But the Secretary of State, who unexpectedly appe

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