Palestinian leader Mahmoud Abbas announced Saturday a cut of all ties with Israel and the United States, including security cooperation, after Washington unveiled a controversial Middle East plan seen as favoring Israel.

Abbas has made similar declarations before and it was not immediately clear what it would mean in practice.

His comments came as the Arab League rejected U.S. President Donald Trump’s plan, which had enraged Palestinians.

“We are informing you that there will be no relations with you (Israel) and the United States, including on security cooperation,” Abbas said at an extraordinary meeting of the pan-Arab bloc in Cairo.

He said the move followed the “disavowal of signed agreements and international legitimacy” by the U.S. and Israel.

RELATED STORIES Palestinians protest Trump's Mideast peace plan

Israel will have to “bear responsibility as an occupying power” for the Palestinian territories and Palestinians will press ahead with resistance using peaceful means, he added.

Abbas made a similar declaration in July 2017, announcing the suspension of security coordination with Israel during a dispute over the flash point Al-Aqsa mosque compound in Jerusalem.

It was resumed later that year, though the Palestinian police chief said that even during the suspension they had maintained regular contact, with 95 percent of the activities continuing.

“The only thing we stopped is we didn’t meet them in the field,” Hazem Atallah said at the time.

The Cairo meeting brought together senior Arab officials, including Saudi Arabia’s foreign minister and the United Arab Emirates’ minister of state for foreign affairs.

Arab League chief Ahmed Aboul Gheit said the U.S. plan was tantamount to creating “a one state with two categories of people, meaning an apartheid system, as it makes Palestinians second class citizens.”

“It is our right to accept or reject (the plan)… though the American proposal in reality appeared to be a dictation, or an offer that cannot be rejected or even discussed,” he added.

The Arab League rejected Trump’s plan, saying in a statement it failed to meet “the minimum rights and aspirations of Palestinian people.”

Arab leaders also vowed “not to… cooperate with the U.S. administration to implement this plan.”

They insisted on a two-state solution that includes a Palestinian state based on borders before the 1967 Six-Day War — when Israel occupied the West Bank and Gaza Strip — and with east Jerusalem as its capital.

There was no immediate reaction from the Israeli government, but Israeli Prime Minister Benjamin Netanyahu’s chief rival in next month’s general election, Benny Gantz, criticized the Palestinian response, saying Abbas “doesn’t miss an opportunity for refusal.”

“The time has come to begin working for the future generations and toward peace, instead of remaining stuck in the past and preventing a future of hope in this region,” Gantz added.

The U.S. plan suggests that Israel would retain control of the contested city of Jerusalem as its “undivided capital,” but Palestinians would be allowed to declare a capital adjacent to Israeli-annexed east Jerusalem.

Trump announced the plan on Tuesday flanked by Netanyahu and in the presence of Arab ambassadors from Bahrain, Oman and the United Arab Emirates.

Other Arab states gave carefully worded initial responses to the plan.

On Saturday, Abbas met Egyptian President Abdel-Fattah el-Sissi, who called for direct negotiations between Israelis and Palestinians.

Abbas told the Arab League the U.S. plan was in “violation of the (autonomy) accords” launched in Oslo in 1993 by Israel and the Palestinians.

The accords included the creation of the Palestinian Authority, currently led by Abbas, and outlined delineations of the West Bank.

They were seen as key to Israeli-Palestinian peace process, which hit an impasse in the years following the signing.

The Trump plan also gives Israel the green light to annex the strategic Jordan Valley — constituting some 30 percent of the West Bank — and all Israeli settlements, which number more than 200.

Abbas said that while Israel would immediately start annexation, under the plan the Palestinians would have to wait four years, until they show “good will,” to get a limited state.

He said he would go to the United Nations Security Council soon to call for an international conference to re-launch negotiations with Israel, under the auspices of the diplomatic Quartet comprised of the US, the EU, the U.N. and Russia, Abbas said.

“But we will not accept the U.S. alone. We have tried it already,” he added.