This is a Russian historical drama film about Woschod 2, the mission that had men's first spacewalk outside a capsule on March 1965.
Since it's based on a actual event, here is a short clip (just 1m39s) of Alexei Leonov speaking about the EVA. He is a nice guy:Spacewalk legend Leonov's plunge into the unknown
The mission had quite some issues, first during the EVA (Leonov couldn't get back in!) and then during landing (the automatic landing system didn't work, so they tried manually but missed the landing area, the technical module didn't separate correctly from the capsule...) , so there is enough material without having to spice things up.
So, the film itself: Judging from the trailer it's a straightforward space-action film, but that is not necessary anything bad. The CGI looks great imho:The Spacewalker Trailer
I will see it tonight, so holding back any further judgment until later.
Where to see it: AFAIK it's not out in the west yet, but there is way. See under spoiler: