Arresting a leader of another Arab country

Saudi regime, by arresting the Prime Minister of Lebanon, established a precedent. The only other case I can think of was in 1977: when Anwar Sadat visited Syria before departing to Israel, ostensibly to explain his mission to Hafidh Al-Asad.  At the time, `Abdul-Halim Khaddam (the foreign minister), urged Hafidh Al-Asad to arrest Sadat to prevent him from visiting the Zionist entity.  Al-Asad refused alas.