How times have changed. Al-Monitor has learned that in the fight against the Islamic State (IS) in Sinai and Salafi groups in Gaza, there has been indirect cooperation as of late between Egypt, Hamas and Israel. Who would have thought?

A Palestinian from Rafah, Mustafa Kalab, conducted a suicide attack against Hamas operatives Aug. 17, killing an officer in the elite Nuhbah unit of Hamas' military wing and wounding five others. Thus, a group that embraced suicide attacks at the start of the 1990s has discovered to its surprise that the “weapon” that elevated it in the eyes of Palestinians in opposing the 1993 Oslo Accord, and even more so, during the height of the second intifada (2000-2005), has now been turned against it.

The honeymoon between Egypt and Hamas began a year ago, following the economic pressure Egypt had put on Gaza — for example, by destroying the smuggling tunnels on the Gaza-Egypt border and Cairo’s ultimatum that Hamas’ security apparatus act against Salafi groups or risk having to deal with President Abdel Fatah al-Sisi. Hamas, forced to choose between life and death, agreed to Egypt’s demand. For entirely practical reasons, today Egypt sees Hamas, yesterday’s enemy, as an ally in the fight against IS and as an additional and crucial component of its security arrangement, along with security cooperation with Israel.

Israel and Egypt have efficiently cooperated on security issues since the Muslim Brotherhood's ouster in 2013. It is reflected, among other things, in Israel consenting to Egyptian military forces entering the Sinai Peninsula, which is restricted by the Israeli-Egyptian peace treaty. There is a blackout regarding Israeli-Egyptian security cooperation from both sides in order, it appears, to avoid embarrassing Sisi, although former Defense Minister Moshe Ya’alon had confirmed in July 2013​, “Any Egyptian force that enters Sinai, enters with our approval. … They truly direct these forces to fighting terrorism.”