Russia has sent a complaint letter to the European football's governing body UEFA over what Moscow says is Ukraine's "political" Euro 2020 kit.
The Russian Football Union (RFS) argues that this "goes against the basic principles" of the Uefa.
The shirt, with a map showing Russian-annexed Crimea as part of Ukraine, earlier provoked anger in Moscow.
Uefa told the BBC the jersey "has been approved by Uefa, in accordance with the applicable equipment regulations."
Russia annexed the Crimean peninsula from Ukraine in 2014, and considers it a part of its territory, something rejected internationally.
The head of the Ukrainian Football Association (UAF), Andriy Pavelko, revealed the kit in a video on his Facebook page on Sunday, just days before the European Championship kicks off.
The front of the yellow and the away blue shirts show the contours of Ukraine in white, including Crimea and the eastern regions of Donetsk and Luhansk, which have been partially seized by pro-Russian separatists.
