Thirty-six Russian citizens were working for the OSCE SMM to Ukraine in occupied Donbas late last year / Photo from UNIAN

"Given the Russian invasion [of Ukraine], it is striking that Ukraine allows Russian citizens to serve along with other monitors," Baer tweeted in Russian during a USApoRusski Twitter Q&A session on Wednesday.

At the same time, he said that the OSCE SMM to Ukraine hires multinational teams whose team leaders should deal with quality control and security reports.

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As UNIAN reported earlier, the OSCE SMM to Ukraine reported in December 2015 that there were 36 Russian citizens who were working as part of the OSCE SMM in Donbas.