The real labs are probably underground in massive areas of the region.
When underground areas are feasible why would anyone put their "A" team bio-weapons above ground?
https://www.cnn.com/travel/article/odessa-catacombs-ukraine/index.html
Dark secrets of Odessa's vast catacomb labyrinth
Pavlo Fedykovych, CNN • Updated 5th September 2019 
1/15 Underground city: Measuring 2,000 meters, the Odessa catacombs are so vast and complicated, tourists are advised not to enter without a qualified guide.
Pavlo Fedykovych
(CNN) — Known as the Pearl of the Black Sea, Odessa is one of the most captivating destinations in Ukraine.
But while its magnificent architecture and beautiful beaches are relatively well known, the most enthralling destination here is actually located way beneath the city.
Deep in the neighborhood of Moldavanka, inside an unassuming garage located off a busy road, lies a special gateway to one of the world's largest urban labyrinths -- the Odessa Catacombs.
On entering, visitors are handed a helmet and a flashlight before descending around 25 meters (82 feet) down into the darkness.
Buried city
Inside the Odessa catacombs
Unlike the catacombs of Paris and Rome, the Odessa catacombs were never used to bury the dead.
With more than 2,000 kilometers (1,243 miles) of tunnels, this underground city is so vast and complicated -- there are at least 1,000 known entrances(this is where the real bio-labs will be no doubt,its a perfect hideout) -- that tourists are advised not to enter without a qualified guide.
Its size seems particularly staggering when compared to the catacombs of Rome and Paris, which span 300 and 500 kilometers respectively.
But unlike those in the French and Italian cities, these underground passages were never used to bury the dead. Now a chaotic system of unconnected caves and abandoned quarries or tunnels spread over three levels, the story behind their existence begins around the time Odessa was founded at the end of the 18th century.
Coquina, a sedimentary rock, largely contributed to the city's rapid growth as it was used to construct the majority of buildings in Odessa at the time.
The principle was simple: if you wanted to build yourself a palace, the easiest way to find the material was to set up a quarry and mine as much coquina as you needed.
When the city experienced a huge commerce boom between 1819 and 1859, many palaces were erected, which meant countless quarries were dug underground.
This process was pretty much unregulated, going some way to explain how large and disordered the area is now.
The catacombs underneath the Moldavanka neighborhood form part of the Secrets of Underground Odessa museum.