"The ministers agreed that there is a window of opportunity to end the conflict in Yemen and to redouble their efforts to reach a political solution", they said.
European Union policy chief Federica Mogherini, a key player in the Iran nuclear deal, will also not attend the two-day conference due to scheduling issues, an European Union official said, although Pompeo will travel to Brussels on Friday to meet with her.
Europe is keen to keep the UN-backed pact alive and has set up a "special objective vehicle" (SPV) enabling trade to continue by accepting payments from companies that want to deal with Iran, either by receiving waivers for oil imports or permissible trade in goods like food and medicine.
He said a new European scheme to trade with Iran, known as the Special Purpose Vehicle, was "an effort to break American sanctions against Iran's murderous revolutionary regime". It is expected Kushner will discuss his peace plan with Arab leaders in private as well as at a public session on the sidelines of the summit with the former Norwegian foreign minister Børge Brende.
Citing a list of regional challenges ranging from Iran, Syria, and Yemen to the peace process between Israel and the Palestinians, Pompeo said, "No one country will dominate the discussion today nor will any one issue dominate our talks".
Morawiecki said he will consider the meeting a success if it brings together governments "that do not agree on all things" and if it becomes a "place of open debate and exchange of arguments for peace for the region".
Earlier at the conference, US Secretary of State Mike Pompeo said that peace and stability in the Middle East was "not possible" without confronting Iran. "Is it no coincidence that Iran is hit by terror on the very day that #WarsawCircus begins?" he wrote, "Especially when cohorts of same terrorists cheer it from Warsaw streets & support it with twitter bots?"
Theresa May asks MPs for more time on Brexit
If Britain leaves the European Union without a trade deal, that would mean a 10 percent import duty on cars and vehicle parts. May "is playing for time and playing with people's jobs, our economic security and the future of our industry", said Corbyn.
"A peace process can not be turned into an attempt to obtain amnesty for war crimes or to make one of the parties surrender its basic rights under the United Nations charter".
"We're back to square one where it is all about Iran", he added. Pompeo told a news conference there were differences during the summit meeting over how to get Iran to change its ways, but there was unanimity, including from Europeans, that Tehran posed a global threat.
Israeli Prime Minister Benjamin Netanyahu sent out a rallying cry to Arab nations at a USA -sponsored Middle East conference in Poland on Wednesday, saying he planned to focus on the "common interest of combating Iran".
Last year, the U.S. unilaterally withdrew from the Iran nuclear deal and reimposed sanctions on Tehran, but European countries have continued to support the multilateral agreement as the best way to deal with Iran's nuclear programme.
The three countries - especially Turkey and Iran - do not agree on the final settlement in Syria, but have been uneasily co-operating to find a solution that does not betray their interests.
Iranian Foreign Minister Mohammad Javad Zarif has called the two-day meeting a "desperate anti-Iran circus" and has kept up a steady stream of tweets mocking it in English.
Amid demands for peace and arguments over the translation and the true intentions of Netanyahu's government, some critics also directed attention to a later comment from the prime minister.
The aftermath of the Iran nuclear deal has seen the warming of relations, however unofficial and clandestine they may generally be, between Israel and large swaths of the Arab world.