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Ukraine is currently launching a counteroffensive in several parts of the nation with the intel from allies across Europe and the USA. Russia has responded by pulling out the much more deadly bombs they have at their disposal, which means a much higher loss of civilians.
One of the deadly weapons Russia is using is their thermobaric bombs which can destroy the lungs of someone, essentially causing them to die by suffication.
These bombs have already been in use for over a decade by the US Military, but rarely used for Urban combat like the Russians are doing.