How to Complete the Russian Gas Mission in Warzone 2 DMZ

Even in 2026, the White Lotus story mission "Russian Gas" continues to be one of the most talked-about challenges in Call of Duty: Warzone 2 DMZ. It’s a late-season, Tier 5 mission that sends operators deep into the mysterious Koschei Complex to investigate a chemical threat tied to the coming Zaya Observatory attack. Many players still struggle to coordinate all three objectives in a single deployment, but a well-planned run can turn this daunting task into a smooth operation. Let’s break down each step so you can claim that Snow Plow operator skin and the juicy 40,000 XP reward without losing your mind.

Infilling into the Koschei Complex with the Vondel Gas Sample

The very first objective seems simple: infil into the Koschei Complex while carrying the Vondel Gas Sample. The catch is that you need to actually possess this mission item before you can even think about entering the complex. Players who have already finished the "Chemist’s Sources" mission will remember the sample – it’s the item you had to extract from the maze just south of the Vondel Fire Department. If you haven’t done that yet, make a quick detour to Vondel. Head to the fire department, locate the maze area south of it, and grab the sample. Then, successfully exfil with it in your backpack. Don’t lose it; otherwise, you’ll be making another trip.

Once the Vondel Gas Sample is safely in your inventory, return to Al Mazrah. Now you need to enter the Koschei Complex through any of its bunker entrances. While you can technically use any entrance, experienced operators recommend heading for the Oasis bunker entrance. Why? Because it drops you directly into the Defense Research Division, which is exactly where you’ll need to be for the second objective. The Oasis entrance is on the northwestern side of Al Mazrah, near the sandy dunes. Stock up on plates, radiation blockers, and a couple of gas masks before you go – the radiated areas inside can chew through your health fast.

Finding the Koschei Complex Gas Sample in the Defense Research Division

After emerging from the Oasis bunker entrance, you’ll be inside the Defense Research Division. The place is dark, damp, and crawling with AI soldiers, so move carefully. The second objective requires you to find the Koschei Complex Gas Sample, which is tucked away in a highly radioactive chamber. Specifically, you’re looking for the third radiated room – the one closest to the Chemical Treatment Plant. Stand at the entrance of that room and look to your right. Inside the first chamber on that side, you’ll spot the sample. It’s just sitting there, waiting to be looted. Picking it up automatically checks off the second task. Keep in mind that the radiation levels are intense here, so pop a radiation blocker and equip your gas mask. If you run out of mask durability, you’ll start taking damage, and the last thing you want is to die before you can validate the samples.

Validating the Chemical Similarity in the External Ops Sector

Now comes the part that can trip up even seasoned operators. The final objective asks you to validate the chemical similarity between the two gas samples using a special machine in the External Ops Sector. There are two ways to reach this sector. If you’re doing the whole mission in one deployment, you can’t just exfil and come back – you must travel from the Defense Research Division through the Chemical Treatment Plant and into External Ops. This route is longer but totally doable if you’ve brought extra supplies. Alternatively, some players prefer to reset and infil directly through the Rohan Oil bunker entrance, which lands them straight in External Ops. The downside? You’ll need to have both gas samples on you when you enter, meaning you must have previously extracted with the Koschei Complex sample. The mission allows for the samples to be carried across deployments, so choose the method that fits your playstyle.

Once inside External Ops, work your way to the far end of the sector. The machine you’re looking for sits on the left-hand side of the room, against the wall. It looks like an industrial analyzer with a small terminal. When you approach it with both the Vondel Gas Sample and the Koschei Complex Gas Sample in your backpack, a prompt will appear. Interact with it, and the validation process begins. After a short animation, the third objective is complete, and the mission is finished. You’ll unlock the Snow Plow skin and earn a massive 40,000 XP bonus.

A few extra tips to keep in mind: always bring a squad if you can. The Koschei Complex is filled with armored guards and other teams trying to complete their own missions. Communication makes everything smoother. Also, don’t forget that you can stash the Vondel Gas Sample in your contraband weapons inventory between attempts. If you die during the validation step, you won’t lose the sample permanently, but you will have to restart the whole infil. In 2026, this mission remains a legendary test of patience and planning. Good luck out there, operator – that gas isn’t going to analyze itself!