The first development was the slaughter of Palestinian protesters on the Gaza border on March 30.
Palestinians had arrived en masse at tented camps near the frontier as a protest dubbed "The Great March of Return" - evoking a longtime call for refugees to regain ancestral homes in what is now Israel - moved into its third week.
At least 30 Palestinians were wounded, the health ministry in Gaza said, with one shot in the head.
Such weekly demonstrations are to continue to mid-May, keeping tensions high along the volatile border.
Two journalists were also wounded on Friday, according to the Palestinian journalists' syndicate.
On Friday Mr Lieberman said there were fewer riots on our border because "the other side" had understood Israel's resolve. British Labour Leader Jeremy Corbyn is calling for Britain to review its weapon sales to Israel, in the wake of the Israeli army's killings of protesters and the journalist.
On Friday, most of the demonstrators assembled in five tent camps located several hundred metres from the border fence. Some protesters burned tires, Israeli flags and threw rocks.
The Israeli government warned that they would use armed force, but such a warning holds no legal or moral value since they were simply saying that they-the Israeli political establishment-would not recognize non-violent protests.
The marches have been organised by Hamas, but large turnouts on two preceding Fridays were also driven by desperation among the territory's 2 million residents.
Lt. Col. Jonathan Conricus said Friday that Palestinians repeatedly tried to damage the border fence, throwing several explosives and fire bombs.
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Gaza has been under an Israeli blockade for a decade and unemployment is approaching 50 percent.
Several thousand people gathered Friday at one of the tent camps, east of Gaza City.
"We want to live like everyone else in the world", he said.
The Palestinian Health Ministry said one person was critically injured.
Sitting under the shade of trees near the kibbutz of Nahal Oz, he said: "Using live fire is a last resort".
Rights group Amnesty International called Friday for the Israeli authorities to "put an immediate end to the excessive and lethal force being used to suppress Palestinian demonstrations in Gaza".
Rights groups say the Israeli military's open-fire regulations are unlawful because soldiers can use potentially lethal force against unarmed protesters. Israel has the ultimate say on what essential supplies enter Gaza. Since late March, 27 Palestinians were killed in protests.
The group has been criticized in Israel for publishing often anonymous testimony by current or former Israeli soldiers who have misgivings about their military service and treatment of Palestinians.
On Friday, hundreds of Jordanians demonstrated in Amman in solidarity with Palestinians.