A US and Israeli Military Strike on Iran: What Just Happened and Why It Matters

The Beginning of Direct Combat

On February 28, 2026, the United States started military operations against Iran. Israel did the same thing at nearly the same time. Together, they launched what became the biggest military conflict in the Middle East in many decades — strikes that pulled in multiple countries within three days and put the entire region's security setup in question.

Both governments told the United Nations they were acting in self-defense. This is a legal requirement under international law when countries use military force. The US sent a formal letter to the UN explaining its actions. Israel did the same. Self-defense is a recognized reason to use force without waiting for UN approval — but it also opens governments to criticism if others believe the response wasn't truly necessary or was too large.

What Triggered the Fighting

The immediate cause was an Iranian attack. On February 28, Iran launched drones and ballistic missiles that struck targets across Israel and several Gulf countries. Explosions happened in multiple places the same day.

Here's where it gets complicated: we don't yet know for certain whether Iran attacked first or whether the US and Israel launched their strikes at almost the exact same moment. This matters legally. If the US and Israel were responding to an Iranian attack that came first, their self-defense claims are stronger under international law. If their operations were already planned and Iran was retaliating to something else, then the legal and political picture changes. Right now, both sides were conducting military operations on the same day — but the exact sequence is still unclear.

The Conflict Spreads

By early March, fighting was in its third day. The US and Israel continued striking targets inside Iran. Iran fired back with more missiles and drones that hit targets not just in Israel but across the Gulf region — places like Saudi Arabia and the United Arab Emirates, which host American military bases.

This creates a serious problem. Countries in the Gulf weren't starting this fight with Iran, yet Iranian missiles are landing on their soil. This forces countries like Saudi Arabia, the UAE, and Qatar to make difficult decisions about whether they need to get directly involved or protect themselves more heavily.

It also tests a diplomatic agreement called the Abraham Accords, in which Israel and several Arab nations agreed to normalize relations. Part of that deal was based on them all seeing Iran as a shared threat. Now that threat is real and deadly — not just a conversation point. That's a very different test of whether they actually stand together.

How International Law Works Here

The United Nations Charter has a rule called Article 51. It says countries can use military force to defend themselves without asking permission first. Countries have used this rule before — after 9/11, for example, when the US went into Afghanistan. The usual pattern is: a country acts, notifies the UN Security Council, and then the Council argues without actually stopping anything, because powerful countries like the US, Russia, or China can block any decision they don't like.

What's unusual about this situation is that two countries — the US and Israel — filed notices at nearly the same time with coordinated military plans. That level of coordination between allies before a war is not common in recent history. It also means that any ceasefire or peace deal has to involve both of them as a team, which makes negotiations harder.

How This Conflict Could Grow — Or Stop

We've seen conflicts in this region follow a familiar pattern before. Something sparks a war, one side retaliates, both sides escalate their attacks, and eventually they find a quiet way to stop — usually through back channels and quiet talks rather than public negotiations. But this situation is different in one big way: this is the first time the United States and Iran have fought a direct, declared military war on Iranian soil. That's a major psychological and political step. It's crossing a line that hasn't been crossed before.

Whether this conflict gets worse depends less on who has the biggest weapons and more on what politicians back home will accept. For Iran's leaders, continuing to strike Gulf countries risks damaging relationships with neighbors they've been trying to build up despite international economic sanctions. For the US, every day of fighting raises questions from Congress about whether this war is authorized and whether allies are truly helping. For Israel, this adds to conflicts already happening elsewhere in the region.

What Happens Now

The most urgent things to watch for are signs of a ceasefire, access for humanitarian aid, and whether other countries will jump in.

A ceasefire — a formal agreement to stop fighting — would need secret talks between the US and Iran, probably through a middleman. Oman has often played this role in past Middle East crises. Whether that channel still works right now is an open question.

Getting food, medicine, and aid to people hurt by the fighting is another immediate need. International organizations like the UN and the Red Cross usually negotiate safe corridors for humanitarian aid in war zones, but both sides have to agree. With three countries actively fighting and Gulf countries being hit by missiles, setting up these corridors will be complicated.

The broader context here is that this war, even if it ends quickly, changes how the Middle East works. Countries will reconsider their military agreements with the US. They'll renegotiate where American troops can be stationed. And markets will immediately start pricing in that energy supplies from this region are now riskier — which will affect global oil prices and energy costs worldwide.

The map of Middle Eastern security, drawn and redrawn since 1979, is being redrawn again. The lines are not yet dry.