Russia’s Foreign Ministry announced plans to summon Romania’s chargé d’affaires in Moscow, the Interfax news agency reported Wednesday.

According to the ministry’s short statement, Liliana Burda was expected to be summoned on Thursday.

The Russian ministry did not publicly confirm plans to summon Burda or the reason for her planned summoning as of publication.

The move would come exactly one month after Moscow’s promise to retaliate after Bucharest in late July declared a Russian diplomat persona non grata over repeated drone incursions into Romanian airspace.

At the time, Romania’s foreign ministry also recalled its own ambassador to Russia for consultations.