Bruce told Fox News that although US President Donald Trump had been very public about his views on the negotiations, which she could not comment on, the terms of a deal should ultimately be determined between Ukraine and Russia.
Bruce emphasized that the US had facilitated negotiations between the parties, who were aware of American requirements, but stressed that the outcome would truly depend on them.
The spokeswoman also said that the US did not want Russia-Ukraine talks to drag on for months and years, believing that every day counts.