The surprise announcement, carried by the state-run Saudi Press Agency, comes as deeply divided Lebanon struggles to handle the fallout from neighboring Syria's raging civil war. The Lebanese government declined to immediately comment on the Saudi decision.
One deal involves a four-year, USD 3 billion Saudi pledge to buy French arms for the Lebanese military, which already has seen the Mediterranean country receive modern anti-tank guided Milan missiles last year. The other involves a USD 1 billion support deal for the Lebanese police.
Bassil is the president of the right-wing Christian Free Patriotic Movement, which is one of the strongest allies of the Iran-backed militant Hezbollah group in Lebanon. Saudi Arabia long has been suspicious of Iran, which also supports Syria's embattled President Bashar Assad.
Relations took a turn for the worse at the start of the year, when Saudi Arabia executed a prominent Shiite cleric and protesters stormed Saudi diplomatic posts in Iran. That prompted Riyadh to cut diplomatic relations with Tehran.
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"Saudi Arabia considers these positions as regrettable and unjustified," the report said. The Lebanese decision is "inconsistent with the fraternal relations between the two countries and they are not taking into account their interests."
The Saudi decision likely will be a painful one for the Lebanese army.
The army is generally seen as a unifying force in Lebanon and draws its ranks from all of the country's sects. However, it's widely viewed as being much weaker than Hezbollah.
Also at play since that time is the dramatic drop in world crude oil prices. Once over $100 a barrel, crude now sells at around USD 30, putting tremendous strain on Saudi Arabia, which has been burning through billions of its reserves. This week, ratings agency Standard & Poor's downgraded the kingdom's credit rating due to low oil prices.