The accession is another step in the Palestinian diplomatic and legal international campaign, which gained steam in 2014.
It has uncertain consequences, not only because it is highly unlikely Prime Minister Benjamin Netanyahu and other Israelis will find themselves being tried at the ICC, but also because it constitutes a new deterioration in the strained relationship.
But the Palestinians are beyond caring.
Exasperated after decades of failed negotiations with Israel, with no perspective for the state they have been yearning, they have decided to take their case to the international arena.
"Palestine has and will continue to use all legitimate tools within its means in order to defend itself against Israeli colonisation and other violations of international law," said senior Palestinian official Saeb Erakat.