Two Americans thought to be fighting for Ukraine died in Donbass, in the east of the country.
This was known by a spokesman for the US State Department quoted by ABC news.
"We can confirm the recent death of two US citizens in the Donbass region of Ukraine," the spokesman said.
"We are in contact with the families and we provide all possible consular assistance".
"Out of respect for families - he concluded - in this difficult moment, we have nothing else".
Thirteen Russian missiles
hit a railway infrastructure in central Ukraine, in the Kirohovrad region, killing and injuring several people according to local officials, the Guardian writes.
Local governor Andriy Raikovych wrote on Telegram that rescue teams are working on the spot and that a small district of the regional capital, Kropyvnytskyi, was without electricity after the attack.
Russian forces
attacked the center of Kharkiv
and at least one wounded was recorded.
This was announced by the mayor of the Ukrainian city, Ihor Terekhov, in a post on Telegram according to what Ukrinform reports.
"Several powerful attacks on the center (of the city). One person has been injured so far. Hopefully the toll will not get worse," Mayor Terekhov wrote.
And the mayor of Mykolaiv, Oleksandr Sienkevych, reported that powerful explosions were heard in the city, where sirens sounded at dawn.
"At around 4:30, powerful explosions were heard in Mykolaiv," Sienkevych wrote.
According to him, all the explosions would have occurred in the same neighborhood.
"We are collecting information - he said -. According to preliminary data, there are no victims," added Sienkevych.
On July 15, a dozen powerful explosions were heard in a Russian missile attack on the city and four civilians were injured.
