"The Second Front" is a Russian-made film about a 1942 attempt by the Nazis to kidnap a German scientist who had fled to England. That part of the plot is just slightly far-fetched, and could have been the fodder for a decent wartime thriller. But in this case, the scientist happens to be Jewish. Germany had many top scientists at work in the war effort, inventing new weapons, etc. And, knowing the vile hatred within the Nazi party of the Jewish people, the idea that they would want to kidnap a Jewish scientist to help them is unbelievable. To the mind of a Nazi, that would be admitting inferiority to a Jew. A more plausible plot might have been one to try to assassinate the Jewish scientist.
So, the preposterous theme of the plot aside, this still might have been a decent thriller of sorts. An interesting thing that I noticed was the unusual aircraft used as the German Red Cross plane. And, the plot of American and Soviet efforts to either kidnap or kill the scientist was a little interesting. This seems to be a post-Soviet era project by Russians to give one example of some coordination and cooperation among the Allied forces in WW II. The Soviet Union was among the Allies fighting Nazi Germany, but the war was barely over when it enclosed most of eastern Europe behind its iron curtain.
As for the acting, at best it is so-so, but there are many instances when it's either wooden or stagy. The production is also quite rudimentary with total breaks between scenes. This is an example on film when research was lacking or ignored about some simple things. For instance, the Russian commando's weapons. They never seem to run out of ammo, and we don't see them carrying any extra. Scenes show Veklich alone (Aleksey Serebryakov) firing what must be about 100 rounds from something like a Tommy gun. Then there is the huge number of German soldiers who supposedly flew on the Red Cross plane. Nowhere before the final battle scene is there any inkling of so many German soldiers. And, even though the inside of the plane looked much larger than it did from the outside, it didn't look like it could hold that many soldiers with their equipment.
This is a weak action thriller of WW II.