Amid talk of peace, the war is stepping up with Russian forces grabbing more territory in Ukraine and Kyiv unfurling high-profile drone and sabotage attacks on Russia's nuclear-capable bomber fleet and, according to Moscow, on railways.
Russia, which controls a little under one-fifth of Ukrainian territory, has taken more than 190sq km of the Sumy region of eastern Ukraine in less than a month, according to pro-Ukrainian open source maps.
Now, according to the Russian defence ministry, units of the 90th Tank Division of the Central Grouping of Russian forces have reached the western frontier of Ukraine's Donetsk region and are attacking the adjacent Dnipropetrovsk region.
"The enemy does not abandon its intentions to enter the Dnipropetrovsk region," Ukraine's Southern Defence Forces said on Telegram.
"Our soldiers are courageously and professionally holding their section of the front, disrupting the occupier's plans.
"This work does not stop for a minute."
The pro-Ukrainian Deep State map showed Russian forces very close to the Dnipropetrovsk region, which had a population of more than three million before the war, and advancing on the city of Kostyantynivka in the Donetsk region from several directions.
A Ukrainian military spokesman, Dmytro Zaporozhets, said Russian forces were trying to "build a bridgehead for an attack" on Kostyantynivka, an important logistical hub for the Ukrainian army.
Russia on Saturday accused Ukraine of delaying the swap of prisoners of war and returning the bodies of 12,000 dead soldiers, although Ukraine denied those claims.
Russia said on Sunday it was moving bodies towards the border.
US President Donald Trump on Thursday likened the war to a fight between young children and indicated he might have to let the conflict play out.
Russian President Vladimir Putin said on Wednesday he did not think Ukraine's leaders wanted peace, after accusing them of ordering a bombing in Bryansk, western Russia, that killed seven people and injured 115 a day before talks in Turkey.
Ukraine, which has not commented on the attack on a Bryansk bridge, has similarly accused Moscow of not seriously seeking peace, citing as evidence Russian resistance to an immediate ceasefire.
Russia is demanding international recognition of Crimea, a peninsula annexed from Ukraine by Russia in 2014, and four other regions of Ukraine that Moscow has claimed as its own territory.
Ukraine would have to withdraw its forces from all of them.
Russia controlled 113,273sq km, or 18.8 per cent, of Ukrainian territory as of June 7, according to the Deep State map.
That is an area bigger than the US state of Virginia.
The areas under Russian control include Crimea, more than 99 per cent of the Luhansk region, more than 70 per cent of the Donetsk, Zaporizhzhia and Kherson regions, all in the east or southeast, and fragments of the Kharkiv and Sumy regions in the northeast
Putin told Trump on Wednesday he would have to respond to Ukrainian drone attacks on Russia's bomber fleet and the bombings of the railways.
The US believes Putin's threatened retaliation against Ukraine over its attacks has not happened yet in earnest and is likely to be a significant, multi-pronged strike, US officials told Reuters.
