KYIV, UKRAINE (AFP) - "Massive" Russian bombardment of Ukraine's battleground eastern Luhansk region and key city Sievierodonetsk has been "hell" for soldiers there, Kyiv said, while insisting that defenders would hold "as long as necessary".
Moscow's troops have been pummelling eastern Ukraine for weeks and are slowly advancing, despite fierce resistance from the outgunned Ukrainian military.
With President Vladimir Putin's forces tightening their grip on the strategically important city of Sievierodonetsk in the Donbas, its twin city of Lysychansk is now coming under heavier bombardment.
"The Russian army is... just destroying everything" in Lysychansk, Sergiy Gaiday, governor of the Luhansk region, which includes both cities, wrote on Telegram.
"It's just hell out there," after four months of shelling in Sievierodonetsk, across the Donets river, he wrote later.
"Our boys are holding their positions and will continue to hold on as long as necessary," he added.
Pro-Russian separatists claimed they were close to surrounding both Lysychansk and Sievierodonetsk.
"Over the past several days, enormous work has been accomplished," Andrei Marochko, an officer in the separatist army of Luhansk, told Russian state TV.
'Outrageous lack of care'
Russian forces have been occupying villages in the area. Taking control of the two cities would give Moscow control of the whole of Luhansk, allowing them to press further into the Donbas.
After being pushed back from Kyiv and other parts of Ukraine following their February invasion, Moscow is seeking to seize a vast eastern swathe of the country.
In a briefing on Wednesday, the Russian defence ministry claimed responsibility for a missile strike it said killed a number of Ukrainian troops in southern Mykolaiv.
City mayor Oleksandr Senkevych told Ukrainian television that the strike hit two firms and a school as well as starting a blaze that authorities could not put out.
In the central Ukrainian city of Zaporizhzhia, women were training to use Kalashnikov assault rifles in urban combat as Russian forces edged nearer.
"Of course, when you can do something, it's not so scary to take a machine gun in your hands," said Ulyana Kiyashko, 29, after moving through an improvised combat zone in a basement.
In his daily address on Tuesday, Ukrainian President Volodymyr Zelensky accused the Russian army of "brutal and cynical" shelling in the eastern Kharkiv region, where the governor said 15 had been killed on Tuesday.
Aid group Doctors Without Borders (MSF) said it had gathered accounts of an "outrageous lack of care to distinguish and protect civilians".
Most patients it had evacuated by train blamed Russian or Russian-backed forces for a spectrum of gruesome injuries, it added.
On the Russian side, officials said on Wednesday two drones had hit an oil refinery in the Ukraine-bordering Rostov region, causing an explosion and a fire but no casualties.
Away from the battlefield, Moscow summoned Brussels' ambassador in a dispute with EU member Lithuania over the country's restrictions on rail traffic to the Russian outpost of Kaliningrad.
The territory is around 1,600km from Moscow, bordering Lithuania and Poland.
By blocking goods arriving from Russia, Lithuania says it is simply adhering to European Union-wide sanctions on Moscow.
The United States made clear its commitment to Lithuania as an ally in Nato, which considers an attack against one member an attack on all.
And Germany urged Russia not to "violate international law" by retaliating against Lithuania.
Also Wednesday, a Turkish cargo ship left the Russian-occupied city of Mariupol on Ukraine's Sea of Azov coast.
Although Moscow and Ankara have negotiated for weeks over getting millions of tonnes of desperately needed grain out of the warzone to worse-off countries in Africa and the Middle East, it was not immediately clear whether the Azov Concord was carrying wheat.
Turkey's defence ministry said four-way talks would be held "in the coming weeks" between Russia, Turkey, Ukraine and the UN, with media reporting the meeting could happen next week.
With US-Russia tensions soaring, the State Department on Tuesday confirmed a second American, 52-year-old Stephen Zabielski, was killed fighting for Ukraine.
A White House spokesman, John Kirby, voiced alarm at Russian statements that it would not apply the Geneva Conventions on the humane treatment of prisoners to two other Americans captured last week, calling suggestions of a death sentence "appalling".
Reporters Without Borders (RSF) said in an investigation published Wednesday that a Ukrainian photojournalist, Maks Levin, had been killed and possibly tortured by Russian troops after his capture on March 13.
In Brussels, ministers unanimously agreed on Tuesday to grant Ukraine and neighbour Moldova candidate status for membership in the European Union.
German Chancellor Olaf Scholz told parliament in Berlin on Wednesday that Ukraine "needs a Marshall Plan for its reconstruction", a reference to the post-World War II aid from Washington that helped a devastated Europe get back on its feet.
Scholz added that Ukraine and Russia were "still far from negotiations... because Putin still believes in the possibility of a dictated peace", urging Kyiv's Western allies to keep up their military and financial support.
Moscow, meanwhile, complained that its delegates to an Organisation for Security and Cooperation in Europe (OSCE) assembly in Britain next month had been refused UK visas.
The Kremlin was on Wednesday turning to other members of the so-called "Brics" grouping that also includes Brazil, India, China and South Africa.
Russia is "actively redirecting its trade flows and external economic contacts towards reliable international partners, above all the Brics countries," Putin told a business forum by video link ahead of a virtual leaders' summit on Thursday.