U.S. Vice President JD Vance on Wednesday urged Iran not to let the fragile ceasefire deal fall apart over Israel's attacks on Lebanon, days before he is due to lead talks with Tehran in Pakistan.

Iran's ambassador to Pakistan deleted a social media post saying an Iranian delegation would arrive in Islamabad on Thursday night, a move an embassy official later told AFP had been sent prematurely.

Iran's parliament speaker said Wednesday that a ceasefire and talks with the United States were "unreasonable" because of violations of Tehran's 10-point truce plan, including continued attacks in Lebanon, a drone entering Iranian airspace and a denial of the country's right to enrichment.

The U.S., Israel and Iran agree that a ceasefire is now in effect, but they're contradicting each other and themselves in terms of what's actually been agreed and what happens now, U.S. news portal Axios reported on Wednesday.

The U.S. has agreed to a two-week ceasefire with Iran proposed by Pakistan, U.S. President Donald Trump said Tuesday night.

Prime Minister of Pakistan Shehbaz Sharif said Tuesday that "diplomatic efforts for peaceful settlement of the ongoing war in the Middle East are progressing steadily, strongly and powerfully with the potential to lead to substantive results in near future," despite the unprecedented tensions in the region.

Pope Leo said Tuesday threats to inflict widespread damage on civilian targets in Iran were "unacceptable" and could breach international law .

Progress has been made in the past 24 hours in the negotiations between the U.S. and Iran, though reaching a ceasefire deal by U.S. President Donald Trump's 8pm ET deadline still looks like a long shot, a U.S. official, an Israeli official and two other sources with knowledge of the talks told U.S. news portal Axios.

The White House denied Tuesday that remarks by Vice President JD Vance about military operations in Iran had contained any suggestion of a U.S. nuclear strike against the Islamic republic.

Ukraine is proposing to Russia a pause in attacks on each other's energy infrastructure over the Orthodox Easter holiday, which will be observed this coming weekend, Ukrainian President Volodymyr Zelensky said.

The offer was made through the United States, which has been mediating talks between delegations from Moscow and Kyiv, Zelensky said, as Russia's invasion stretches into a fifth year.