FILM IDENTIFIED (IN RECORD TIME): "Первый день мира"
The stills shown in the previous post belong to the soviet film "Первый день мира" from 1959. Huge debt of gratitude to the scholars at Slavcin-L, who identified it. In the western world, the film seems to have been released under two titles: "The Day the War Ended" and "The First Day of Peace" which is the correct translation of the title. It was released on the 28th of January, 1961 in New York City, hence, some sites show it as a 1961 film.
You can find all information for the film, including cast and crew, opening dates and stills in the following links: