Russia's drone production jumped by 16.9% in May compared to the previous month, according to data from a thinktank close to the Russian government.
The average increase from the previous five months was just 3.7%, according to the Centre for Macroeconomic Analysis and Short-Term Forecasting.
The thinktank also said the level of production in May was 1.6 times higher than average monthly output in 2024.
In April, Vladimir Putin said more than 1.5 million drones of various types had been produced last year, including around 4,000 first-person view (FPV) drones - lightweight models designed for precision targeting.
Both Russia and Ukraine have deployed drones on a huge scale, using them to spot and hit targets both on the battlefield and well beyond the front lines.