Washington, April 14 -- In a rare diplomatic opening, Washington is gearing to mediate between Israel and Lebanon, with US Secretary of State Marco Rubio set to host Israeli and Lebanese ambassadors for direct talks, marking the highest-level diplomatic engagement between the two sides in more than three decades.

The meeting, scheduled for Tuesday in the American capital, will bring together Israeli Ambassador Yechiel Leiter and Lebanese Ambassador Nada Hamadeh, alongside senior US officials including Rubio, Ambassador Michel Issa and State Department Counsellor Michael Needham.

The meeting marks the most significant direct contact between Israel and Lebanon since 1993, as the two nations' diplomatic relationship has remained mired in dec...