Question: What was the name of the military operation where on June 26, 1941, the leader of the 2nd tank division was killed?

Context paragraphs:
14th Mechanized Corps (Soviet Union): The corps was formed in March 1941 at Kobryn under the command of Major General Stepan Oborin as part of the 4th Army in the Western Special Military District.  Colonel Ivan Tutarinov was its chief of staff.  The corps' 22nd Tank Division was formed from the 29th Tank Brigade in the southern military camp on the outskirts of Brest.  The 30th Tank Division was formed from the 32nd Tank Brigade in Pruzhany, later moving to Slobodka.  The howitzer artillery regiments of the divisions were formed from howitzer artillery battalions of the 4th Army's rifle divisions.  The 205th Motorized Division was formed and stationed in Bereza Kartuska and the surrounding villages.  It was formed from the 3rd Motorized Machine Gun Artillery Brigade in the 42nd Rifle Division's barracks, after the 42nd had moved to Brest.  The 205th Division had a low level of combat readiness.  From mid-June the corps began creating a field command post in the area of Tevli.  The corps was equipped with 534 tanks, most of which were the obsolete T-26.  The corps had half of its authorized 1,031 tanks.

Yegor Solyankin: Yegor Nikolaevich Solyankin (Russian: Егор Николаевич Солянкин ; 1901– 26 June 1941) was a Red Army major general.  Solyankin led the 2nd Tank Division during the Battle of Raseiniai, a Soviet counterattack after the German invasion of the Soviet Union.  He was killed in action during the defeat of his division.

111th Tank Division (Soviet Union): The 111th Tank Division was a Tank division of the Soviet Union's Red Army and after 1946, the Soviet Army.  The division was formed in the summer of 1941 in the Soviet Far East from the tank regiment of a motorized division that had been reorganized into a motor rifle division, and had thus lost its tank regiment.  The division never fought in combat and was in reserve during the Soviet invasion of Manchuria.  Postwar, the division continued its garrison duty in the Far East.  The 111th was renumbered as the 16th Tank Division (Second Formation) in 1955.

13th Mechanized Corps (Soviet Union): The 13th Mechanized Corps was formed in March 1941 in Bielsk Podlaski as part of the 10th Army in the Western Special Military District.  Major General Pyotr Akhlyustin commanded the corps, Major General Vasily Ivanov was its deputy commander for combat troops, and Colonel Ivan Grizunov was its chief of staff.  The division's 25th Tank Division was formed from the 44th Light Tank Brigade at Gomel and was later relocated to Łapy.  The division had most of the corps' tanks.  The 31st Tank Division was formed from the 1st Tank Brigade (Second Formation) at Gmina Boćki.  By 30 May, the division had only one full tank regiment, the 62nd, with few armored vehicles.  The 208th Motorized Division was formed at Hajnówka from the 14th Motorized Machine Gun-Artillery Brigade.  With its positions in the center of the Białystok salient, the corps was to support the 5th Rifle Corps.  By 22 June, when the German invasion of the Soviet Union began, the corps had 294 light tanks, including 263 T-26s and 15 BT tanks.  A small number of T-34 and KV-1 tanks were transferred to the corps from the 6th Mechanized Corps for training purposes.  The corps was at 49 percent of its strength.

16th Tank Division (Soviet Union): The 16th Tank Division was a tank division of the Soviet Union's Red Army and later the Soviet Army, formed twice.  The division was first formed during the summer of 1940 at Kotovsk, Ukraine with the 2nd Mechanized Corps.  After the German invasion of the Soviet Union began in June 1941, the division was sent into the fighting along with its corps.  The division was destroyed along with its corps during the Battle of Uman.  The division was reformed in 1955 from the 111th Tank Division in the Soviet Far East, and was disbanded two years later.

Battle of Raseiniai: The Battle of Raseiniai (23–27 June 1941) was a large tank battle that took place in the early stages of Operation Barbarossa, the German invasion of the Soviet Union.  The battle was fought between the elements of the German 4th Panzer Group (General Erich Hoepner) and the Soviet 3rd Mechanized Corps (Major General Alexey Kurkin) with the 12th Mechanised Corps (Major General Nikolai Shestapolov), in Lithuania, 75 km north-west of Kaunas.  The commander of the Soviet Northwestern Front, Colonel General Fyodor Kuznetsov, tried to contain and destroy the German troops that had crossed the Neman River (Nemunas) but was unable to prevent them from advancing.  The result of the battle was the destruction of most of the Soviet armoured forces of the Northwestern Front, which cleared the way for the Germans to attack towards the crossings of the Daugava River (Western Dvina).  The fighting around Raseiniai was one of the main battles of the initial phase of Operation Barbarossa, referred to in Soviet historiography as the Border Defensive Battles (22–27 June 1941) and formed part of the larger Soviet Baltic Strategic Defensive Operation.

28th Mechanized Corps (Soviet Union): The 28th Mechanized Corps was formed in March 1941 in Yerevan, part of the Transcaucasian Military District.  The corps included the previously formed 6th Tank Division at Vagharshapat, the 54th Tank Division at Leninakan, and the 236th Motorized Division at Ashtarak.  The 54th Tank Division was reorganized from the 17th Light Tank Brigade.  The 236th Motorized Division was formed from the 41st Light Tank Brigade.  The corps was commanded by Major General Vasily Novikov.  Its chief of staff was Kombrig Nikolai Trufanov.

2nd Armored Brigade (People's Republic of China): The 2nd Armored Brigade, originally the 2nd Tank Division and the 2nd Armored Division, is an armored formation of the People's Liberation Army of the People's Republic of China.

12th Armored Brigade (People's Republic of China): The 12th Tank Division () was formed on October 12, 1969 from 12th Independent Tank Regiment, 264th Tank Self-Propelled Artillery Regiment of Academy of Armored Troops and 2nd Tank School Training Regiment.  After its formation the division was soon moved to Jiuquan and Jiayuguan City in Gansu province.

4th Armored Brigade (People's Republic of China): The 4th Tank Division () was formed on April 1, 1969 from 237th Tank Self-Propelled Artillery Regiment from 32nd Army Division, 252nd Tank Self-Propelled Artillery Regiment from 46th Army Division,253rd Tank Self-Propelled Artillery Regiment from 47th Army Division and 397th Tank Self-Propelled Artillery Regiment from 192nd Army Division.

Supporting paragraphs: Yegor Solyankin Battle of Raseiniai
Answer: Operation Barbarossa