as commenters claimed he was blaming the Ukrainian military for the deaths.

Arestovich shared his handwritten letter of resignation, addressed to Andrey Yermak, Zelensky's chief-of-staff, on Tuesday morning. He claimed he was showing "an example of civilized behavior" by leaving his position in the Ukrainian government. Later in the day, Zelensky's office confirmed that Arestovich's request had been accepted. The presidential aide previously described his remark as "a serious mistake, made during a live broadcast."
[...]
Arestovich previously claimed that he'd received a tip from an acquaintance, an experienced military expert, who said he'd heard a blast from an interceptor missile before the Russian missile hit the residential building in Dnepr ["Dnipropetrovsk"] on Saturday [14 Jan]. He reported it during a YouTube [!] interview the same day.

The Ukrainian Defense Ministry denied having engaged the projectile and claimed that, in the first place, it didn't have the capability to intercept Kh-22 air-launched cruise missiles. It claimed that its previous statements [?] that some missiles of that model had been intercepted were "inaccurate." ...

Advisor to the Presidential Office, Oleksii Arestovych, has submitted his resignation statement at own will. Arestovych announced this on his Facebook [!] page on Tuesday, January 17.

"I wrote a resignation letter. I want to show an example of a civilized behavior: it's a fundamental mistake, so I'm resigning," Arestovych stressed.

As the Ukrainian News agency earlier reported, on January 16, a member of the Verkhovna Rada / representative of the Voice faction, Solomyia Bobrovska, said that she was preparing a collective MP appeal to the Security Service of Ukraine [SBU] regarding the statements by the adviser to the President's Office, Oleksii Arestovych, as for the "shooting down of a missile" in Dnipro.
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On January 15, presenter Oksana Sokolova wrote on her Facebook [!] page that the Advisor to the Presidential Office Oleksiy Arestovych should be punished for his statement that a Russian missile hit a residential building in Dnipro, allegedly due to the actions of Ukrainian air defense....

Arestovych announced this on Facebook [!], Ukrainian News Agency reports. In the comments under his post about writing his resignation statement, Arestovych confirmed that the Office of the President granted his application.
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Later, the Armed Forces of Ukraine said that they did not have the ability to shoot down Kh-22 missiles.

...She said the tribunal could also include international elements, "at a location outside Ukraine, with financial support from partners and with international prosecutors and judges, so that impartiality and legitimacy are guaranteed."

Baerbock said she had discussed the idea with her Ukrainian counterpart Dmytro Kuleba last week during her surprise visit to the eastern city of Kharkiv. She said the proposed solution was "not ideal, not even for me," but said it was necessary "because international law currently has a hole in it." ...

According to her, for the first time in the 31 years of its independence, Ukraine has established the production of its own 82mm fragmentation mines [image]. In order to secure the production cycle and labor teams, production was launched at the capacities of partner countries.[...]
"We managed to increase the number of fragments by 2-2.5 times. During tests on a shield target at a distance of five meters from the epicenter of the explosion, we counted almost 460 fragments, while the regular Soviet mine has 198 fragments. At a distance of 10-15 meters, the number of affected elements was also many times greater. Therefore, the Ukrainian ["]mine["], which is designed to destroy enemy personnel at a distance of 4,500 meters, will be more effective," Sad said.

According to [Ukroboronprom spokesperson Nataliia Sad], although the establishment of production was announced recently, in fact, it happened a little earlier and tens of thousands of new ["]mines["] have already been shipped to Ukrainian defenders. They have proven themselves well in combat conditions.
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According to her, although the establishment of production was announced recently, in fact, it happened a little earlier and tens of thousands of new ["]mines["] have already been shipped to Ukrainian defenders. They have proven themselves well in combat conditions....According to her, new shells of Soviet 122mm and 152mm calibers, which are already produced in Ukraine, as well as with the involvement of the capacities of NATO member countries, have proven themselves well at the front. The volume of their production is also increasing. After all, the need for such ammunition is growing every day. The task is to provide the lion's share of the Ukrainian Defense Forces' needs for such scarce projectiles at the expense of own production.