"Military action from outside of Yemen against its territorial integrity and its people will have no other result than more bloodshed and more deaths," said Iranian Foreign Minister Mohammad Javad Zarif.
A statement from the embattled Syrian regime of President Bashar al-Assad, a key Iranian ally, decried the Saudi royal family's "blatant aggression on Yemen."
Russia, Assad's main friend on the U.N. Security Council, urged a cessation in hostilities and called for "a broad national dialogue" in Yemen, though no such mediation looks anywhere in sight.
Perhaps the most revealing set of statements regarding Yemen came from Lebanon, a country that for years has been a microcosm of the Arab world's larger political and sectarian divisions.
Hezbollah, a powerful Shiite organization backed by Iran, said the Saudi "adventure" in Yemen lacked "wisdom and legal and legitimate justification."
Meanwhile, Saad Hariri, a leading Lebanese Sunni politician whose father's assassination was blamed on Hezbollah agents, praised the Saudi king's "wise and brave" intervention on Twitter.
"Iranian meddling in Yemen necessitates an Arab reaction," he added.
It's not totally clear to what extent the Iranians have fueled the Houthi uprising, which, as explained above, has considerable indigenous support.
Kenneth Pollack, a senior fellow at the Center for Middle East Policy, writes, "The Iranian role has been greatly exaggerated in what is first and foremost a Yemeni civil war."
Whatever the case, the Houthis are using the moment to pin their colors to the national mast.
"We will react against Saudi oppression in all ways we are capable," said one Houthi spokesman, quoted by the Wall Street Journal. "Yemeni blood is not cheap. Saudi has announced war in Yemen."
The awkward job of the United States
The Saudi-led campaign in Yemen comes at a particularly sensitive moment for the Obama administration.
U.S. officials are in the middle of critical meetings this weekend with Iranian counterparts in Switzerland, attempting to thrash out a long-sought deal over Tehran's controversial nuclear program.
Moreover, as Saudi bombs fell on Iranian-backed militias in Yemen, the U.S. conducted airstrikes in Iraq that directly aided Iranian-backed militias fighting the jihadists of the Islamic State.
The United States has so far offered logistical support and intelligence help to the Saudi-led effort and issued statements earlier condemning the Houthi advance on Yemen's "legitimate government." Over the past few years, the United States has seen its conflicting commitments to Middle East democracy, regime change, security and political stability get entangled in a mess of regional crises. The irony of the present was best illustrated in a tweet by Lebanese satirist Karl Sharro.