Ukraine's militaries claims to have broken through Russia's first line of defence in the occupied Kherson places.
The reported push appears to form part of a long-awaited counter-offensive being launched by Kyiv in an attempt to recollect the country's south.
Its after weeks of Ukrainians attacks aimed at cutting off Russian forces there from main supply place.
Russia's militaries claims that Ukrainian troops have heavy losses during the unsuccessful attacking attempt.
The claim by both Ukrainians militaries and Russians militaries have not been independently comfirm.
Russia has occupied large swathes of Ukraine's Kherson place since its invasion began on 24 February.
On Monday, Ukraine's Kakhovka operational gang in the south said that one regiment of Russian-backed forces had leaves its positions in the Kherson.
It added that Russians paratroopers providing the back-up had fled the battlefield.
Ukraine's Hromadske TV said three of its news sources in Ukraine's military confirmed that the first line of defence has been broken.
That Means, Ukrainian army spokeswoman Natalia Humeniuk said "any military operation requires 'silence' regime", saying Ukrainians to be patient.
"Our efforts is on destroying our enemy's ammunition storage bases. More than 10 of such bases have been destroyed over the past week," she said.
But Ms Humeniuk no give more details.
Russia's defence ministry saying on Monday that Ukrainian troops had attempted an offensive in the Kherson and neighbouring Mykolaiv places.
The ministry is quoted by Russia's state-run news agencies as saying this operation had failed, and that the Ukrainian troops had heavy losses.
On Monday, the Ukrainians militaries also said it had in struck multiple targets in the kherson, including a factory in Beryslav and a Russian army post by the North Crimean Canal.
Kyiv officials claim to have used US-supplied Himars rocket systems to attack three bridges crossing the Dnipro River, strikes it said would cut the Russians forces eating Kherson off from weapons and troop reinforcements.
According to Western military sources, Kyiv's strikes on the river crossings are part of a targeted effort to isolate Russian troops on the right (western) bank of the river with the ultimate goal of finishing the entire Kherson region.
Moscow relied on the bridges to support their troops stationed west of the Dnipro river, who are now may be coming isolated from the rest of Russia's finishing forces.
Russian outlets also said on Monday that Ukraine had struck targets in the Kherson region - but reported that the strikes was on civilian infrastructure.
Moscow-appointed regional official Vladimir Leontyev claimed on Monday that Ukrainian forces had shelled a hydropower plant and floodway in the Kherson city of Novaya Kakhovka, according to Russia's TASS news agency.
Its forces also claimed to have shot down three ballistic missiles and 21 rockets reportedly fired by Ukrainian forces.