But there is also optimism, palpable among the officials around him on the trip, that U.S. diplomacy, at last, has a chief who can speak for the president and will focus on the department's core missions. Stillart said Lahoud gave his life helping the people of Yemen.
Yemen has been embroiled in a civil war since March 2015, a conflict that has created the world's worst humanitarian crisis.
The latest attack came as the Huthis staged a public funeral for a slain commander in the Yemeni capital Sanaa.
Al-Samad, who held the post of president in the Houthi-backed political body, was the most senior official to be killed by the Western-backed alliance, which had offered a $20-million United States reward for any information that led to Samad's capture.
Top officials in the Houthi government attended the funeral proceedings, including Mahdi al-Mashat, who was appointed to replace al-Samad.
Houthi supporters gather near the site of burial of Saleh al-Samad.
The Houthis said they launched eight ballistic missiles at "economic and vital targets" in Saudi's Jizan province on Saturday.
The Lebanese al-Mayadeen television channel reported a Saudi strike near the funeral ceremony but there were no immediate reports of possible casualties.
The missiles were headed towards the city of Jazan in southern Saudi Arabia, according to the Arab Coalition statement, which was carried by the state-run Saudi Press Agency (SPA).
In the meantime, the rebel-run Al-Masirah TV says Saturday's missiles hit their targets with "excessive accuracy".
The Saudi state media also reported that the kingdom-led coalition in an air strike killed two Shiite rebel leaders and dozens of their militiamen in Sanna.
The rebels, generally known as Houthis, have beforehand fired missiles focusing on the Saudi mainland, together with the capital, Riyadh.
Saudi Arabia backs Yemen's internationally recognized government and aims to defeat the Iran-backed Houthis to restore the government to power.
Yemeni forces regularly fire ballistic missile at positions inside Saudi Arabia in retaliation for the Riyadh-led campaign. The rebels did not immediately acknowledge the strike.
That dispatch followed a far more detailed report on the strike by Al-Arabiya, a Dubai-based satellite news network now believed to be majority-owned by Saudi Arabia.
At least 38 Houthi militants were killed when a coalition airstrike led by Saudi Arabia targeted the building of Yemen interior ministry in Sanaa in the intervening night of Friday and Saturday.