The Ukrainian National Guard said a Russian missile strike during a training exercise in the Ukrainian Sumi border area killed six soldiers and injured more than 10 other soldiers.

Russia's defense ministry earlier released a videotape claiming a Iskander missile attack was shown in the training camp, while the state news agency said as many as 70 people were killed.

The Sumi area was repeatedly bombed, and Ukraine began a month-long occupation of part of the Russian neighbor Kursk region.

The Ukrainian military said the purpose of the offensive was to help build a buffer zone to protect Sumi, but some complained about the scale of military losses.

The Kremlin said he visited the area for the first time the day before since Ukrainian troops were forced to leave the area, and Vladimir Putin visited Kursk officials the day before.

State media reported that he met volunteers and acting local governor Alexander Khinshtein and visited nearby nuclear power plants.

The Ukrainian National Guard confirmed a fatal strike against Sumi Ukrainian soldiers earlier Wednesday, which occurred as the unit practiced within the shooting range. It added that the commander was suspended and formal investigations were conducted.

Unverified Russian military videos show dozens of soldiers walking on a trail near the forested area before exploded and smoke.

Research validated by the BBC shows that the training camp targets the northern part of the Sumy region, south of the Russian border.

The attack was a major blow to the Ukrainian army, and the National Guard said it had previously developed an "action algorithm" as well as the threat of air strikes and the orders for people to gather in one place.

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Ukraine's general staff said this week it thwarted Russia's bid to establish a "safety zone" in the Sumi region and saw its Kursk operation as "strategic" and forced Russia to transfer its "most capable troops" to deal with the offensive.

The Kremlin also sent thousands of North Korean soldiers to the area to retake the area.

However, last week, a battalion commander named Oleksandr Shyrshyn was cited for criticizing the “temporary mission” set by the military leadership and the unreasonable losses.

Hopes of an imminent ceasefire are disappearing despite low-level talks between Ukraine and Russia in Istanbul last Friday.

Although President Donald Trump suggests that further negotiations may take place in the Vatican, the Vatican says the idea of ​​hosting or even mediating the talks is more promising than any specific plan.

U.S. Secretary of State Marco Rubio said he hopes Russia can propose "a broad clause that will move us toward a ceasefire", but Ukraine's Volodymyr Zelensky said Russia is just "trying to buy time to continue to continue the war and occupation".