United Nations – In a high-stakes move that will soon enable them to pursue war-crimes charges against Israel, The Palestinians submitted documents to the United Nations to join the International Criminal Court on Friday.

The Palestinians are moving to join the court after suffering a defeat in the U.N. Security Council, which rejected a resolution that would have set a three-year deadline for the establishment of a Palestinian state on lands occupied by Israel.

Israel has threatened retaliation if the Palestinians join the court, and the United States has also vehemently opposed the move as an obstacle to hopes of reaching an Israeli-Palestinians peace deal.

The Palestinian ambassador to the United Nations, Riyad Mansour, delivered the documents — known as instruments of ratification — to Assistant Secretary-General for Legal Affairs Stephen Mathias on Friday morning.

The International Criminal Court has recognized the U.N. General Assembly’s recognition of Palestine as an observer state. Handing over the paperwork is the last formal step for Palestine to become a member of the ICC, which would take at least 60 days.

Palestinian President Mahmoud, under heavy pressure to take stronger action against Israel after a 50-day war with between the Jewish state and militants in Gaza over the summer, signed the documents after the Security Council rejected the resolution.

At the international court, the Palestinians could seek to have Israeli military or political figures prosecuted for alleged crimes involving settlement construction on occupied lands or actions by the military that cause heavy civilian casualties, for instance.