The growing military alliance is rooted in a shared belief among Egypt's President Abdel-Fattah el-Sisi and Gulf Arab leaders that extremism must be confronted region-wide.
It has also been anchored with a quid-pro-quo: Gulf oil powerhouses Saudi Arabia, United Arab Emirates and Kuwait have given Egypt an estimated $30 billion to rescue its damaged economy and in return Egypt's military provides manpower alongside its Gulf counterparts.
With the alliance, Egypt, which at 90 million people is the biggest Arab country, seeks to maneuver itself into a leadership role that has eluded it in recent years, first because of waning influence under former President Hosni Mubarak, then because of the turmoil that followed his 2011 ouster.
A contingent of Egyptian troops is already deployed on Saudi Arabia's border with Iraq to help defend it against jihadi fighters, who earlier this year carried out a deadly cross-border raid, according to Egyptian military and security officials.
On another front, Gulf nations have said they are considering what action to take in Yemen, where Shiite rebels known as the Houthis – widely suspected of being linked to Iran – have taken power in the capital and are fighting to take over more of the country.
Egypt, said the officials, already has military advisers on the Saudi-Yemeni border, with their task focused mainly on developing tactics with the Saudis for the eventuality of hostilities. The officials, who have first-hand knowledge of Egypt's plans, spoke on condition of anonymity because they were not authorized to talk about the deployments. They did not elaborate on the size of the deployments.
Plans for the creation of a military alliance with Saudi Arabia, United Arab Emirates, Kuwait and possibly Jordan were back on track after a period of hiatus, said the officials, with France, Italy and Algeria now viewed as possible additional partners.
Already, Saudi Arabia and the Emirates are bankrolling multibillion dollar arms purchases by Egypt, including jet fighters and naval pieces from both France and Russia. A deal with Germany to buy two submarines is under discussion, said the officials.
Separately, Egypt is trying to convince the West to open up a new front against the Islamic State group, this time in Libya, Egypt's western neighbor, and is appealing for "political and material" support to enable it to contain the threat in Libya.
El-Sisi on Tuesday called on the United Nations to approve a new coalition for airstrikes in Libya, where the extremists have set up their first major affiliate outside of Iraq and Syria. He argued in a radio interview that the Islamic State group in Libya is not just a threat to Egypt – its militants beheaded a group of Egyptian Christians in a video released this week – but to Europe as well.
"I want to say humanity will judge us if we do not fight against terrorism and protect humanity," el-Sisi told France's Europe 1 radio in an interview aired on Tuesday.
France and Italy, directly across the Mediterranean from Libya, have come out in favor of some form of international action. The UN Security Council holds an emergency session Wednesday on the Libya crisis.
The more assertive Egyptian-Gulf campaign, however, threatens to mire Egypt in multiple fights that could further enflame the ongoing conflicts. Egypt's military has been battling ferociously in Sinai, for example, but has been unable to suppress jihadis who have now sworn allegiance to the Islamic State group. They are believed to number in the hundreds or low thousands, bristling with heavy weapons smuggled in from Libya.
Striking militants in Libya could prompt an even more brutal response from Sinai extremists, who previously have carried out high-profile bombings in Cairo and other Egyptian cities.
"Gulf states want Egypt to stand by them in the face of the region's entire range of crises," a prominent Saudi journalist, Abdullah Nasser al-Otaibi, wrote in Monday's edition of the pan-Arab daily Al-Hayat. "They want to see heavyweight Egypt on their side unconditionally to end the Syrian crisis. They also want a clear and pragmatic position as well as an actionable plan to intervene in Yemen and save it from the control of Houthis, who take their orders from the clerical regime in Tehran."
In Yemen, Saudi Arabia has already started arming Sunni tribesmen to fight back against the Houthis. But the Saudis and Egyptians may have little appetite for ground action in the mountainous, chaotic country.
Egyptian columnist Abdullah el-Sinnawi, who is close to the military, wrote that Egypt's navy could deploy if there is any threat to shipping in and out of the Red Sea. Yemen lies on one side of the narrow entrance to the Red Sea, the only route to Egypt's Suez Canal from Asia.
But Egypt cannot "endure a long war abroad" or the distraction of the military from the fighting in the Sinai, he wrote Monday in the Al-Shorouk newspaper.
In recognition of the limits, the security officials said Egypt was not looking, at least for now, for a ground campaign in Libya, but rather an air assault similar to that by the US and its allies in Iraq and Syria. Egypt carried out two rounds of airstrikes in Libya on Monday, on top of secret strikes it conducted last year along with the United Arab Emirates against Libyan Islamist militias.
The officials said Egyptian troops briefly crossed the border into Libya Monday to conduct search-and-destroy missions targeting possible surface-to-air rockets that could threaten warplanes headed back from Libya.
As a precaution against possible retaliation from militants, Egyptian naval units in the area and border guards have been placed on high alert.
Egypt is likely to continue launching airstrikes against Islamic State positions focusing on arms depots and training camps, the officials said. A second phase of the campaign could involve special forces targeting high-value assets inside Libya, they said.
"This is a war that is as or more crucial than the 1973 war," said a top Egyptian official, alluding to Egypt's last war against Israel, when Egyptian troops crossed the Suez Canal to storm fortified Israeli positions on the waterway's east bank.