12th Operational Brigade (Ukraine)

**129th Special Motorized Militia Battalion** (1990-1992)

**10th Separate Battalion of the NGU** (1992-1995)

**17th Separate Special Motorized Battalion** (1995-2014)

**18th Operational Regiment of the National Guard of Ukraine** (2014-2019)

**12th Separate Operational Brigade** (2019-2023)
129th Special Motorized Militia Battalion (1990-1992) 10th Separate Battalion of the NGU (1992-1995) 17th Separate Special Motorized Battalion (1995-2014) 18th Operational Regiment of the National Guard of Ukraine (2014-2019) 12th Separate Operational Brigade (2019-2023)
	Brigade Insignia
Active	1990-2023
Disbanded	Late 2023
Country	Ukraine
Branch	National Guard of Ukraine (1990-1995) ; Internal Troops of Ukraine (1995-2014); National Guard of Ukraine (2014-23)
Type	Brigade
Size	Five Battalions
Garrison/HQ	Mariupol
Nickname(s)	Dmytro Vyshnevetsky Brigade
Engagements	Russo-Ukrainian War War in Donbass Battle of Mariupol (2014); ; ; Russian invasion of Ukraine Siege of Mariupol; ;
Decorations	Courage and Bravery
Commanders
Notable; commanders	Colonel Denis Oleksiyovych Shlega; Colonel Serhii Yevhenovich Sovinskyi; Colonel Oleksandr Ivanovych Kryachko

The 12th Brigade of Operational Assignment (12 BrOP — military unit 3057) was a military formation of the National Guard of Ukraine. It was part of the Eastern operational territorial association. It was based in Mariupol, Donetsk Oblast.