But as the Palestinians threaten to submit a draft text tomorrow to the UN Security Council, Kerry hinted Washington did not believe now was the right time as Israel gears up for snap elections in March.
Speaking to reporters just before meeting with chief Palestinian negotiator Saeb Erakat in London, Kerry said he had had a series of "candid and constructive conversations" during his three-day whirlwind trip to Europe.
"But we're also very mindful that we have to carefully calibrate any steps that are taken for this difficult moment in the region. We all understand the challenges that are presented by this conflict."
Amid reports of competing Arab-backed and French-led resolutions, Kerry has been meeting his European and Russian counterparts as well as Israeli Prime Minister Benjamin Netanyahu to gauge support for the Palestinian UN push.
Also Read
France is putting together a more nuanced version setting a two-year timetable for concluding a peace treaty, without mentioning the withdrawal of Israeli forces.
Asked what kind of resolution the US might be able to support at the UN, Kerry insisted the US administration has "made no determinations... About language, approaches, specific resolutions, any of that."
Traditionally the US has used its power of veto at the UN Security Council to shoot down what it sees as moves against its close ally, Israel.