"That is a very sad mistake, it is a great pity that it happened," Flosdorff told journalists.
Earlier on Monday, German government spokesman Steffen Seibert said that the government was concerned about the large number of victims in Syria in the past days despite the reached ceasefire deal.
The airstrikes by the coalition planes near the Deir ez-Zor airport were first reported by the Syrian army on Saturday. Later in the day, the Russian Defense Ministry confirmed the attacks, saying 62 servicemen were killed and another 100 injured in the attacks. The US Central Command said that the Syrian forces had been mistaken for the fighters of Daesh terrorist group, outlawed in many countries, including Russia and the United States.