Saudi-Iran 'proxy wars' play out in embattled Lebanon
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The Saudi foreign ministry said the measures were taken after "insulting" remarks made by a Lebanese minister on the Yemen war, but also due to the influence of Lebanon's Iran-backed Shiite movement Hezbollah.
The group, it said, controls Lebanese ports and "hijacks" the government's decision-making in Beirut.
The United Arab Emirates, Bahrain and Kuwait were quick to follow suit.
The crisis is a fresh blow to Lebanon, a country in financial and political turmoil where a fragile government is struggling to secure international aid, namely from wealthy Arab neighbours.
But remarks by Information Minister Georges Kordahi, in an interview recorded back in August aired on Monday, slamming the Saudi-led military intervention against Iran-backed Huthi rebels in Yemen, undermined these efforts.
Analyst Karim Bitar said Kordahi's remarks were just a trigger for a looming geopolitical showdown.
The escalation "has very little to do with what this mediocre minister of information said... (and) everything to do with the Saudi-Iranian tug-of-war that has been ongoing for the past few years".
- 'Battlefields' -
"Kordahi was only a pretext for something that was long in the making," he said.
Riyadh's move also reflects the kingdom's determination to push Lebanon "to take a harsher line on Hezbollah", he said.
Lebanese Prime Minister Najib Mikati has said he "regrets" the Saudi decision, and urged Riyadh to reconsider its move.
He did not explicitly call for Kordahi's resignation, but said he did not speak in the name of the government.
He urged the minister to "take into consideration Lebanon's national interest... in order to appease ties with Gulf countries".
Kordahi was nominated by the Marada Movement, a Christian party allied to Hezbollah and led by Suleiman Franjieh.
The minister has refused to apologise -- as both Hezbollah and Franjieh rejected calls for his dismissal.
With Lebanon in the grip of an economic and financial crisis -- seen by the World Bank as one of the world's worst since the 1850s -- the diplomatic row becomes all the more damaging.
- 'Paying the price' -
The arch-rivals broke diplomatic ties in 2016 after protesters attacked Saudi diplomatic missions in the Islamic republic following the kingdom's execution of a revered Shiite cleric.
Bitar said the latest crisis is also linked to these negotiations between Riyadh and Tehran, with Lebanon "paying the price".
Mikati's fragile government has not met for three weeks amid a campaign spearheaded by Hezbollah to remove a judge investigating last year's devastating blast at Beirut port, accusing him of political bias.
"Lebanon needs a cabinet and gains nothing by shooting itself in the foot as it finds itself in the midst of a regional clash," said Michael Young, an analyst with the Malcolm H. Kerr Carnegie Middle East Centre.
"Since the Saudis regard Lebanon as an Iranian card, they feel it makes sense to behave toward the country" in its current manner, he added on Twitter.