Thousands of Palestinians protested Wednesday in Gaza against Israel's West Bank annexation plans, as Prime Minister Benjamin Netanyahu said talks were ongoing on the project, which faces intensifying international opposition.

Netanyahu's center-right coalition government had set July 1 as the date from which it could begin implementing United States President Donald Trump's Middle East peace proposal.

While no major announcement was expected on Israel's self-imposed kick-off date, Netanyahu's office said talks with U.S. officials "on the application of sovereignty" were ongoing.

Netanyahu was also discussing annexation with his security chiefs, it added, saying "further discussions will be held in the coming days."

In Gaza City, several thousand protesters gathered, some brandishing Palestinian flags and placards condemning Trump.

"The resistance must be revived," Gaza protester Rafeeq Inaiah told Agence France-Presse (AFP). "Israel is afraid of force."

Smaller demonstrations were held in the West Bank cities of Ramallah and Jericho, attended by a handful of left-wing Israeli politicians opposed to annexation.

"We want to affirm our support for peace," former Labour party official Ophir Pines-Paz told AFP.

The Trump plan, unveiled in January, offered a path for Israel to annex territory and Jewish West Bank settlements, considered illegal under international law.

Netanyahu supports the Trump plan, which has been roundly rejected by the Palestinians. But the veteran right-wing premier has not laid out how he intends to implement the U.S. proposals.

Growing global opposition

Writing in Israel's Yedioth Ahronoth newspaper on Wednesday, Britain's Prime Minister Boris Johnson said that although he was a "passionate defender of Israel," he viewed annexation as "contrary to Israel's own long-term interests."

"Annexation would represent a violation of international law," he said.

Australia, in a rare criticism of Israel, warned against "unilateral annexation or change in status of territory on the West Bank."

France, Germany, several other European states and the United Nations all oppose annexation.

Germany's parliament, however, passed a motion Wednesday warning against "unilateral sanctions or threats of sanctions" on Israel over annexation.

Such moves would "have no constructive effect" on the Israeli-Palestinian peace process, it said.

The EU cannot threaten sanctions against Israel without unanimous support among members.

Jordan, one of only two Arab nations that has diplomatic ties with Israel, has repeatedly warned against the move, saying annexation could trigger a "massive conflict."

Domestic opposition

Israel's defense minister and alternate Prime Minister Benny Gantz has said annexation must wait until the coronavirus crisis has been contained, amid a sharp spike in new Israeli and Palestinian cases.

Israel annexed east Jerusalem following the 1967 Six Day War and then the Golan Heights on the Syrian border in 1981, in moves never recognized by most of the international community.

While some settlers have urged Netanyahu to take similar action in the West Bank, some hardliners oppose the Trump plan as it envisions the creation of a Palestinian state across roughly 70% of the West Bank.

Despite the mounting headwinds, experts have stressed that Netanyahu may still move forward in the coming days, noting that he is keenly watching the U.S. presidential election and may be eager to act if he fears Trump will not win a second term.

Presumptive U.S. Democratic Party nominee Joe Biden is opposed to any unilateral annexations by Israel.