Nickolay Mladenov, the UN special Middle East coordinator, told the Security Council yesterday that "the coming period will be critical to the future of the peace process."
Peace talks between Israel and the Palestinians have been comatose since a major US push for a final deal ended in failure in April 2014.
UN efforts to revive the peace process were effectively on hold in recent months as Israel held elections and Prime Minister Benjamin Netanyahu formed a new government that was announced last week.
The envoy, who took up his post last month, renewed a UN call for a freeze on Israeli settlement activity and urged the new government to reverse decisions on three recent tenders for new construction.
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The United Nations has repeatedly called on Israel to halt the construction of Jewish settlements on Palestinian land, which it has branded as illegal and a move to erase the prospect of a Palestinian state.
Mladenov's predecessor, Dutch diplomat Robert Serry, told the Security Council in March that the settlements were threatening to "kill the very possibility of reaching peace."
Serry said in his final report to the council that he was unsure whether it was "already too late."
The UN push to put peace talks back on track comes amid discussions at the Security Council on a possible draft resolution that would outline the parameters of a final deal.