It was not the first time that the vice president had addressed Ukraine’s leader with words more commonly spoken to toddlers than heads of state.

President Volodymyr Zelensky of Ukraine and other European leaders have learned a thing or two about negotiating, Trump-style. So has Vladimir Putin.

The leaders presented a relatively united front and appeared to agree on the next steps in the effort to halt the fighting between Ukraine and Russia. But much remained unresolved.

It was not the first time that the vice president had addressed Ukraine’s leader with words more commonly spoken to toddlers than heads of state.