Google Translate has a feature where you can “write” the text (instead of typing) and it will give you suggestions for the characters and words that you might be looking at. I had a quick play with this, and managed to get a few of the words.
On the first poster, the header says something about freedom (свободы = of freedom)
and then something about war (война = war).
The second poster says something about military (военный = military).
Not especially informative, but you might like to experiment to crack some more of it?
