At least 100 North Korean troops deployed to Russia have been killed with another 1,000 injured in combat against Ukrainian forces in intense fighting in the Kursk region, Reuters cited a South Korean lawmaker said on Thursday citing the country's spy agency.

The heavy losses are attributed to the lack of experience by North Korean troops in drone warfare and unfamiliarity with the open terrain where they are taking part in the battle, a member of parliament Lee Seong-kweun told reporters.

Lee was speaking after a closed-door briefing by the National Intelligence Service (NIS) to parliament.

The discrepancy in the estimate of the troops killed from that made by a U.S. military official who cited several hundred casualties is because of the relatively conservative analysis by the NIS, Lee said.

"There was a report that there have been at least 100 deaths and the injured are approaching 1,000," he said.

There are indications that the North is preparing for additional deployment, Lee said, including intelligence of the country's leader Kim Jong Un overseeing training, read the report.

The report echoed comments by U.S. and Ukrainian officials that North Korean losses are heavy and that Russia was using them in large numbers in assaults in Kursk, a Russian region where Ukraine launched a cross-border incursion in August.

More than 10,000 North Korean troops have been deployed to help Russia in the war, according to U.S. and South Korean officials. Pyongyang has also shipped more than 10,000 containers of artillery rounds, anti-tank rockets as well as mechanised howitzers and rocket launchers.

Neither the North nor Russia have officially acknowledged the troop deployment or the weapons supply.

Russian President Vladimir Putin visited Pyongyang in June and signed a "comprehensive strategic partnership" treaty with North Korean leader Kim Jong Un that included a mutual defence pact.

Earlier on Thursday, North Korea said its military alliance with Russia is proving "very effective" in deterring the United States and its "vassal forces," denouncing a recent statement by Washington and allies against ties between Pyongyang and Moscow, Reuters reported.

North Korea made no mention of its involvement in the war in Ukraine or casualties.

Instead it denounced a statement by the United States and nine countries and the European Union issued on Monday as "distorting and slandering the essence of the normal cooperative relations" between the North and Russia.

In a statement by an unnamed foreign ministry spokesman, the North blamed Washington and its allies for prolonging the Ukrainian war and destabilising the security situation in Europe and Asia-Pacific.

"It is because of the misguided acts of the U.S. and the West persisting in their structure-destructive, hegemony-oriented and adventuristic military policy," it said.

The United States, joined by Arab mediators, sought to conclude an agreement between Israel and Hamas to halt the 14-month-old war in the Gaza Strip, where medics said Israeli strikes killed at least 20 Palestinians on Wednesday.

A Palestinian official close to the negotiations said on Wednesday that mediators had narrowed gaps on most of the agreement's clauses. He said Israel had introduced conditions which Hamas rejected but would not elaborate.

On Tuesday, sources close to the talks in Cairo, the Egyptian capital, said an agreement could be signed in coming days on a ceasefire and a release of hostages held in Gaza in return for Palestinian prisoners held by Israel.

Medics said an Israeli airstrike killed at least 10 people in a house in the northern town of Beit Lahiya while six were killed in separate airstrikes in Gaza City, Nuseirat camp in central areas, and Rafah near the border with Egypt.

In Beit Hanoun in the northern Gaza Strip, medics said four people were killed in an airstrike on a house. There was no immediate comment from the Israeli military spokesman.

Later on Wednesday, medics told Reuters that an Israeli strike on a house in Jabalia killed at least 10 people.

Israeli forces have operated in the towns of Beit Hanoun and Beit Lahiya as well as the nearby Jabalia camp since October, in a campaign the military said aimed to prevent Hamas militants from regrouping.

Palestinians accuse Israel of carrying out acts of "ethnic cleansing" to depopulate the northern edge of the enclave to create a buffer zone. Israel denies it.

Hamas does not disclose its casualties, and the Palestinian health ministry does not distinguish in its daily death toll between combatants and non-combatants.

On Wednesday, the Israeli military said it struck a number of Hamas militants planning an imminent attack against Israeli forces operating in Jabalia.

Later on Wednesday, Muhammad Saleh, director of Al-Awda Hospital in Jabalia, said Israeli shelling in the vicinity damaged the facility, wounding seven medics and one patient inside the hospital.

The Israeli military had no immediate comment.

In the Central Gaza camp of Bureij, Palestinian families began leaving some districts after the army posted new evacuation orders on X and in written and audio messages to mobile phones of some of the population there, citing new firing of rockets by Palestinian militants from the area.

CEASEFIRE GAINS MOMENTUM

The U.S. administration, joined by mediators from Egypt and Qatar, has made intensive efforts in recent days to advance the talks before President Joe Biden leaves office next month.

In Jerusalem, Israeli President Isaac Herzog met Adam Boehler, U.S. President-elect Donald Trump’s designated envoy for hostage affairs. Trump has threatened that "all hell is going to break out" if Hamas does not release its hostages by Jan. 20, the day Trump returns to the White House.

CIA Director William Burns was due in Doha on Wednesday for talks with Qatari Prime Minister Sheikh Mohammed bin Abdulrahman Al Thani on bridging remaining gaps between Israel and Hamas, other knowledgeable sources said. The CIA declined to comment.

Israeli negotiators were in Doha on Monday looking to bridge gaps between Israel and Hamas on a deal Biden outlined in May.

There have been repeated rounds of talks over the past year, all of which have failed, with Israel insisting on retaining a military presence in Gaza and Hamas refusing to release hostages until the troops pulled out.

The war in Gaza, triggered by a Hamas-led attack on communities in southern Israel that killed some 1,200 people and saw more than 250 abducted as hostages, has sent shockwaves across the Middle East and left Israel isolated internationally.

Israel's campaign has killed more than 45,000 Palestinians, displaced most of the 2.3 million population and reduced much of the coastal enclave to ruins.