Makeshift shrine to Sergei Nigoyan, killed allegedly by police.
Larger sign is in Russian except the Ukrainian top line:
Help(?) for the Maidan
For each patriot beaten up: ten enemies of Ukraine beaten up.
For each patriot killed: ten enemies of Ukraine killed.
The smaller signs are one in Ukrainian
Sergei Nigoyan
1/24/2014
Killed
[the rest is illegible]
... the other in Russian.
Seryozha, I will always remember you
Sleep in peace, you are a pure and noble man.
God [?} takes so [illegible] the most worthy.
The two bumper sticker shaped say "People of Ukraine" and "Don't make the Maidan angry!". There is also a request for something warm and for cigarettes.
Nigoyan was ethnically Armenian.