Rassvet is the 3rd region in Metal Gear Solid 3 Delta: Snake Eater.
Collectibles Overview:
Rassvet
Kerotan #5 – From entering the area, go directly north into the first partially destroyed building to see a hole in the middle of the wall to the left of the staircase, look through the hole to see it. (not the hole you can crawl through, it’s next to that)
Weapon (M37) – Turn around from shooting the above Kerotan and you’ll see this right behind some crates ahead of you.
Ga-Ko #5 – Go to the back of the partially destroyed building, left of where you go to meet Sokolov. Behind the crates you will find this on a shelf.
Rat – Go around to the back of the main building where you meet Sokolov, there is a crawl space by some crates leading under the building, you can find rats here.
When you gain control of Snake after some cutscenes, Ocelot will be knocked out on the floor. Save your game and then kill Ocelot to unlock 
Time Paradox, then reload your save. After this you must backtrack to the previous area to get some cutscenes, then you spawn in the next area.
NEXT: Dremuchij (2nd Visit)
For an overview of all regions and collectibles by type, refer to Metal Gear Solid 3 Delta: Snake Eater Collectible Guide.
Mike says
If you shake down Ocelot after the cut-scene you’ll get a mousetrap.