Oleksandr Syrskyi, the commander of Ukrainian ground forces, said on Tuesday that the situation around the eastern town of Bakhmut was "extremely tense."
"Despite significant losses, the enemy threw in the most prepared assault units of Wagner, who are trying to break through the defenses of our troops and surround the city," Syrskyi was quoted as saying on Ukraine's Media Military Center Telegram messaging platform.
Russia's mercenary Wagner Group has played a significant role in Russia's invasion of Ukraine.
The small mining city of Bakhmut has been the scene of fierce fighting in recent weeks.
Capturing it would open the way for Russia to control urban centers in the eastern Ukrainian Donetsk region, and would represent the first major win for Moscow in months.
Ukraine's general staff said Russia intensified its forces in Bakhmut and was shelling settlements around the city.
"The enemy is constantly destroying everything that can be used to protect our positions for fortification and defence. Our soldiers defending the area around Bakhmut are true heroes," Ukrainian President Volodymyr Zelenskyy said in his evening video address.
Here are some of the other notable developments concerning the war in Ukraine on Tuesday, February 28:
Russian court fines Wikipedia owner over 'misinformation'
A Russian court has slapped the Wikimedia Foundation with a fine of 2 million rubles (roughly €25,000, $27,000) after authorities accused it of "spreading misinformation" about the Russian military.
Wikimedia, which owns Wikipedia, has already faced fines in Russia. Last year, it was fined for not deleting two articles about the war.
The organization said it was considering appealing the ruling, but it had not yet made a decision.
"So far, in the history of courts in Russia, Wikipedia has only had one successful experience of appealing court verdicts," the head of the foundation's Russian chapter, Stanislav Kozlovskiy, told Reuters news agency.
Russia reports failed drone attacks
Russia's Defense Ministry accused Kyiv of launching attempted drone strikes against civil infrastructure targets in two southern Russian regions overnight. The ministry said the alleged attacks had failed.
"Overnight, the Kyiv authorities attempted to use unmanned aerial vehicles to attack civilian infrastructure facilities in the Krasnodar and Adygea regions," the ministry said in a statement.
It added that its anti-drone defense systems had repelled the attacks.
"Both drones lost control and deviated from their flight paths. One fell into a field, the other, deviating from its trajectory, did not harm the intended target," it said.
Before the ministry's statement, Russian state news agencies had reported a fire at an oil depot in the Krasnodar region, around 240 kilometers (149 miles) southeast of the Crimean peninsula.
Earlier on Tuesday, Russia's Ministry of Emergency Situations said several regional television and radio stations broadcast air raid alerts after a hacking attack.
According to Russian media, alerts were broadcast in the Belgorod and Voronezh regions bordering Ukraine.
"As a result of hacking of servers of radio stations and TV channels, in some regions of the country, information about the announcement of an air raid alert was broadcast," the ministry said in a statement.
"This information is false and does not correspond to reality," it added.
The ministry said a similar cyber attack had triggered air raid sirens across Russia last week.
NATO chief says Ukraine will join the alliance in the 'long-term'
NATO Secretary-General Jens Stoltenberg said Ukraine would become part of the military alliance in the future, but stressed that in the meantime it's important that the country "prevails as a sovereign independent nation" in the face of Russia's invasion.
"NATO allies have agreed that Ukraine will become a member of our alliance, but at the same time that is a long-term perspective," Stoltenberg told reporters during a visit to Finland's capital Helsinki.
Moscow has cited its worries about what it claims is a NATO eastward expansion as one of its reasons to launch what it describes as a "special. military operation" against Ukraine, as Kyiv has ambitions to join the alliance.
Stoltenberg was speaking alongside Finnish Prime Minister Sanna Marin, whose country — which borders Russia — has joined Sweden in dropping decadeslong policies of military non-alignment and is seeking to join NATO.
"The time has come" for Hungary and Turkey to ratify NATO membership for Finland and Sweden, Stoltenberg said, as Budapest and Ankara continue to block the ratification.
Belarus' Lukashenko talks Ukraine in Beijing
Belarusian President Alexander Lukashenko is set to arrive in Beijing on Tuesday, kicking off a three-day trip in which he will meet his Chinese counterpart Xi Jinping.
A key ally of Russian President Vladimir Putin, Lukashenko's visit comes after Beijing clarified its position on Russia's war in Ukraine, calling for dialogue between the two sides.
In an interview with China's state-run Xinhua news agency, the Belarusian leader praised Beijing's statement as "a testimony to its peaceful foreign policy as well as a new and original step that will have a far-reaching impact all over the world."
Lukashenko's Beijing visit comes as the EU extended its sanctions on Belarus over Minsk's repression of political opposition and its support for Russia's war.
Germany's Rheinmetall to supply reconnaissance systems
Germany's industrial giant Rheinmetall has said it won an order in the double-digit million-euro range to supply Ukraine with automated reconnaissance systems.
In a statement, Rheinmetall said it was now cooperating with the Estonian company DefSecIntel to provide the SurveilSPIRE systems, consisting of mobile surveillance towers with day and night-capable camera equipment, autopiloted mini drones and a control system.
The company added that the products' delivery had already begun.
Russia not open to giving up disputed regions
Kremlin spokesman Dmitry Peskov told reporters that Russia was open to negotiations to end the Ukraine conflict but that new "territorial realities" could not be ignored.
The comments were made in reference to China's support for a negotiated solution to the conflict.
Russia proclaimed it had annexed the Donetsk, Luhansk, Kherson and Zaporizhzhia regions last September, something that Kyiv and the West have slammed as illegal.
But now those regions have been named as constituent subjects of the Russian Federation in a constitutional decree.
"The constitution of the Russian Federation exists, and cannot be ignored. Russia will never be able to compromise on this, these are important realities," Peskov added.
Ukraine has said that no peace plan can be discussed unless Russian troops abandon all occupied territories, including the four annexed regions and the Crimean peninsula, which Moscow unilaterally annexed from Ukraine in 2014.
Blinken on Central Asia trip
US Secretary of State Antony Blinken arrived in Kazakhstan for a Central Asia trip following the first anniversary of Russia's war in Ukraine.
During a meeting with his Kazakh counterpart, Blinken vowed US support for the country's independence.
"As you know well, the United States strongly supports Kazakhstan's sovereignty, its independence, its territorial integrity," Blinken said.
"Sometimes we just say those words and they actually have no meaning. And of course, in this particular time, they have even more resonance than usual," he added, referring to Russia's assault on Ukraine.
Blinken later held talks with President Kassym-Jomart Tokayev and was set to fly to Uzbekistan afterward.
In Astana, the top US diplomat is due to meet the ministers of all five former Soviet republics in Central Asia, including Kyrgyzstan, Tajikistan and Turkmenistan.
The five countries abstained or did not vote last week to back a UN General Assembly resolution calling on Russia to withdraw its forces from Ukraine.
Wrecked Russian tank to be exhibited in the Netherlands
German police said on Tuesday that the destroyed Russian tank that had been on display in front of the Russian Embassy in Berlin had been removed.
The T-72 tank was displayed in front of the embassy in the German capital's city center to serve as a memorial against the war on the first anniversary of Moscow's full-scale invasion of Ukraine.
The organizers of the project said it would be exhibited in the Netherlands next.
According to the organizers, the tank was destroyed when it hit a mine during a Russian attack on the Ukrainian capital, Kyiv, in March.
The vehicle is on loan from the Military History Museum of the Ukrainian Defense Ministry, which also supported its transport.
Peskov says 'a bit early' to tell if Putin will run for reelection
Kremlin spokesman Dmitry Peskov said Russian President Vladimir Putin has not yet said if he would run for the country's next presidential election, scheduled for 2024.
"We have not yet heard him say anything about whether he will run or not. That means it is still a bit early," Peskov told Moscow daily Izvestia in comments published on Tuesday.
Peskov added that Putin was currently very busy and not in the mood to campaign.
Putin served as Russia's president from 2000 to 2008, and since 2012. He was prime minister from 1999 to 2000 and from 2008 to 2012.
Ukraine spy chief says 'no signs' China arming Russia
Kyrylo Budanov, Ukraine's military intelligence chief, said in an interview that he saw no signs that China and Russia were in discussions about arms supplies.
"As of now, I do not think that China will agree to the transfer of weapons to Russia," Budanov told Voice of America (VOA). "I do not see any signs that such things are even being discussed."
Earlier this month, US Secretary of State Antony Blinken said Washington had information that suggested China was considering providing Russia with "lethal support."
Several media outlets have since reported, citing unidentified senior US officials, that Beijing was deciding whether to supply Moscow with drones and munitions as Russia suffers heavy losses in its war in Ukraine.
"I am the head of intelligence and I rely, with all due respect, not on the opinions of individual people, but only on facts. I do not see such facts," Budanov said.
The military intelligence chief added that "almost the only country that actually transfers more or less serious weapons [to Russia] is Iran."
Budanov dismissal of the claims came after Beijing called for a cease-fire as part of a peace plan it proposed.
China's proposal has been largely met with skepticism, but Kyiv has sought to improve its ties with Beijing, Moscow's key ally.
More DW coverage
Ukraine's joining of the EU is conditional on anti-corruption and de-oligarchizing reforms. But though the war has dented the wealth of the leading oligarchs, they remain rich and still want to wield influence.
At the UN Human Rights Council, Ukraine has condemned what officials have called Russia's systematic deportation of Ukrainian children. One estimate suggests more than 6,000 Ukrainian children have been held at sites in Moscow-annexed Crimea and Russia.
The war in Ukraine has forced many people onto the front lines. But while soldiers defend their country on the battlefield, Ukraine's best handball team HC Motor Zaporizhzhia is representing the nation in Germany.
fb/nm (AFP, AP, dpa, Reuters, Interfax)