Israel’s intense bombardment of the Gaza Strip this week marked the most serious challenge yet for a fragile, U.S.-brokered ceasefire.

The United Nations Special Envoy for Yemen, Martin Griffiths, said he was working to build on the prisoner exchange agreement announced on Sunday to pave the way for a national ceasefire to be followed by a political solution.

Along Lebanon's border, Israel has continued demolitions and attacks despite a ceasefire in the country's war with Hezbollah last year.

The strike is the latest in a series of preemptive Israeli actions designed to prevent Hezbollah from rehabilitating the extensive infrastructure damaged during recent hostilities. The IDF confirmed carrying out an airstrike targeting Hezbollah infrastructure in the Lebanese city of Tyre on Thursday.

The United States on Thursday lifted an embargo on defense trade with Cambodia, after President Donald Trump oversaw the signing of a ceasefire deal between Cambodia and neighboring Thailand last week.

Relations between the two neighbors hit a low point this month, with fighting killing people on both sides of the border. At issue is a rise in militancy in Pakistan since the Taliban took over Afghanistan.

As the ceasefire holds, displaced Palestinians in the Gaza Strip continue to live a difficult life, with limited aid and poor living conditions across the enclave.

A humanitarian ceasefire will take effect Monday morning in the fighting between Armenia and Azerbaijan over the mountainous enclave of Nagorno-Karabakh, a joint statement from the U.S. State Department and the two governments said on Sunday.