Top Ukrainian officials were traveling to Washington for defense talks with U.S. officials, the presidential office said Monday, as Russia intensifies attacks on Ukraine's energy grid and Washington weighs the delivery of long-range missiles.

The team, led by Ukraine's Prime Minister Yulia Svyrydenko, will discuss "strengthening our air defense and strike capabilities" and "enhancing (energy) resilience before winter," Andriy Yermak, chief of staff to President Volodymyr Zelensky, said on social media.

The European Union's top diplomat Kaja Kallas said Monday that Russia was "gambling with war", after a spate of Russian drones and military jets crossing into the bloc's airspace.

"Every time a Russian drone or plane violates our airspace, there is a risk of escalation, unintended or not. Russia is gambling with war," she said during a visit to Kyiv, calling on Europe needs to beef up its defense capabilities.

Hamas released all 20 remaining living hostages held in Gaza on Monday, while Israel began releasing hundreds of Palestinian prisoners as part of a ceasefire pausing two years of war that pummeled the territory, killed tens of thousands of Palestinians, and had left scores of captives in militant hands.

Cheering crowds greeted buses of prisoners in the West Bank, while families and friends of the hostages gathered in a square in Tel Aviv, Israel, cried out with joy and relief as news arrived that the captives were free.

The United Nations peacekeeping mission in Lebanon said Sunday that one of its members was wounded by an Israeli grenade dropped near a U.N. position in the country's south, the third incident of its kind in just over a month.

U.S. President Donald Trump and his Egyptian counterpart Abdel Fattah al-Sisi will on Monday chair a Gaza peace summit in Sharm el-Sheikh, also attended by world leaders including the U.N. chief.

Three Qatari diplomats were killed and two injured in a car crash on Sunday near the Egyptian town of Sharm el-Sheikh, according to the Gulf state's embassy.

A Hamas source close to the group's negotiating committee told AFP on Sunday that it will not participate in post-war Gaza governance, as world leaders prepare to converge on Egypt for a Gaza peace summit.

Lebanese President Joseph Aoun condemned Israel on Saturday for carrying out overnight strikes on civilian facilities that the health ministry said killed at least one person.

"Once again, southern Lebanon has been the target of a heinous Israeli aggression against civilian installations -- without justification or pretext," Aoun said.

Britain, France and Germany will seek to restart stalled nuclear talks with Iran and the United States, the three European countries said in a joint statement on Friday.

Israel declared a ceasefire in Gaza and began to pull back its forces on Friday, as tens of thousands of exhausted Palestinians made their way back to their devastated homes.