Fyodor Andreyevich Sergeyev (Russian: Фёдор Андре́евич Серге́ев , Ukrainian: Федір Андрійович Сергєєв ; March 19, 1883 – July 24, 1921), better known as Comrade Artyom (това́рищ Артём ), was a Russian revolutionary, Soviet politician, agitator, and journalist.
 He was a close friend of Sergei Kirov and Joseph Stalin.
 Sergeyev was an ideologist of the Donetsk-Krivoy Rog Soviet Republic.
The Treaty of Brest-Litovsk was a peace treaty signed on 3 March 1918 between the new Bolshevik government of Soviet Russia and the Central Powers (Germany, Austria-Hungary, Bulgaria, and the Ottoman Empire), that ended Russia's participation in World War I.
 The treaty was signed at Brest-Litovsk (Polish: "Brześć Litewski" ; since 1945 Brest), after two months of negotiations.
 The treaty was agreed upon by the Bolshevik government under threat of further advances by German and Austrian forces.
 According to the treaty, Soviet Russia defaulted on all of Imperial Russia's commitments to the Triple Entente alliance.
The Donetsk People's Republic (DPR or DNR) (Russian: Доне́цкая Наро́дная Респу́блика , "Donétskaya Naródnaya Respúblika"; ] , Ukrainian: Донецька Народна Республіка , "Donets'ka Narodna Respublika ") is a self-proclaimed state in the Donetsk Oblast of Ukraine.
 It has been recognized only by the partially recognized Republic of South Ossetia.
 It receives humanitarian and military backing from Russia.
 The Ukrainian government has designated it as a terrorist organization and it is at war with Ukraine, alongside the Luhansk People's Republic (LPR).
 It formed an unrecognized confederation of Novorossiya, referencing the corresponding historical region and its name with the also unrecognized LPR until its 20 May 2015 suspension, and since February 2015 has postured itself as the successor to the historic Donetsk–Krivoy Rog Soviet Republic.
 Along with the Luhansk People's Republic and the Autonomous Republic of Crimea, the Donetsk People's Republic is considered one of three temporarily occupied territories of Ukraine as a result of Russian military intervention of 2014.
North Caucasian Soviet Republic (Russian: Се́веро-Кавка́зская Сове́тская Респу́блика , "Severo-Kavkazskaya Sovetskaya Respublika") (July 7–December, 1918) was a territory in the North Caucasus established to consolidate Soviet power during the Russian Civil War.
 A republic of the Russian SFSR, it was created by merging the Kuban-Black Sea Soviet Republic, the Stavropol Soviet Republic, and the Terek Soviet Republic.
 Its capital was Yekaterinodar; however, on August 17, 1918 Yekaterinodar was taken by Denikin's Volunteer Army, and the capital was moved to Pyatigorsk.
The Bavarian Soviet Republic (German: "Bayerische Räterepublik" ) was the short-lived unrecognised socialist state in Bavaria during the German Revolution of 1918–19.
 It took the form of a workers' council republic.
 Its name is variously rendered in English as the Bavarian Council Republic or the Munich Soviet Republic (the German name "Räterepublik" means a republic of councils or committees; council or committee is also the meaning of the Russian word "soviet") after its capital of Munich.
 It was established in April 1919 following the demise of Kurt Eisner's People's State of Bavaria and sought independence from the also newly-proclaimed Weimar Republic.
 However, it was overthrown less than a month later by elements of the German Army and the paramilitary "Freikorps".
The Persian Socialist Soviet Republic (widely known as the Soviet Republic of Gilan) was a short-lived Soviet republic in the Iranian province of Gilan that lasted from June 1920 until September 1921.
 It was established by Mirza Koochak Khan, a leader of the Constitutionalist movement of Gilan, and his "Jangali" (Jungle Movement) partisans, with the assistance of the Soviet Red Army.
The Lithuanian Soviet Socialist Republic (LSSR) was a short-lived Soviet republic declared on December 16, 1918 by a provisional revolutionary government led by Vincas Mickevičius-Kapsukas.
 It ceased to exist on February 27, 1919 when it was merged with the Socialist Soviet Republic of Byelorussia to form the Lithuanian–Byelorussian Soviet Socialist Republic (Litbel).
 While efforts were made to represent the LSSR as a product of a socialist revolution supported by local residents, it was largely a Moscow-orchestrated entity created to justify the Lithuanian–Soviet War.
 As a Soviet historian, adhering to official propaganda, put it: "The fact that the Government of Soviet Russia recognized a young Soviet Lithuanian Republic unmasked the lie of the USA and British imperialists that Soviet Russia allegedly sought rapacious aims with regard to the Baltic countries."
 Lithuanians generally did not support Soviet causes and rallied for their own national state, declared independent on February 16, 1918, by the Council of Lithuania.
The Donetsk–Krivoy Rog Soviet Republic (Russian: Донецко-Криворожская советская республика ) was a self-declared Soviet republic of the Russian SFSR founded on 12 February 1918.
 The republic claimed "self-determined" territories in treaties of Brest-Litovsk; it was founded three days after the government of Ukraine signed the treaty with Germans, which recognised the borders of Ukrainian People's Republic, within which the Donetsk-Krivoy Rog Soviet Republic was located.
 On 29 March 1918 it became a republic within Ukrainian Soviet Republic, where it was merged with Ukrainian People's Republic of Soviets (capital in Kharkov, founded 25 December 1917) and Odessa Soviet Republic (founded 1 March 1918), until the last was fully occupied by the German forces according to treaties of Brest-Litovsk.
The Chinese Soviet Republic (CSR), also known as the Soviet Republic of China or the China Soviet Republic, is often referred to in historical sources as the Jiangxi Soviet (after its largest component territory, the Jiangxi-Fujian Soviet).
 It was established in November 1931 by future Communist Party of China leader Mao Zedong, General Zhu De and others, and it lasted until 1937.
 Discontiguous territories included the Northeastern Jiangxi, Hunan-Jiangxi, Hunan-Hubei-Jiangxi, Hunan-Western Hubei, Hunan-Hubei-Sichuan-Guizhou, Shaanxi-Gansu, Szechuan-Shensi, Hubei-Henan-Anhui, Honghu and Haifeng-Lufeng Soviets.
The Soviet westward offensive of 1918–1919 was part of the general move of the Russian Soviet Federative Socialist Republic into areas abandoned by the Ober Ost garrisons that were being withdrawn to Germany following that country's defeat in World War I.
 The initially successful offensive against Estonia ignited the Estonian War of Independence which ended with the Soviet recognition of Estonia.
 The war against Latvia and Lithuania was more successful for the Soviets, and resulted in the Latvian Socialist Soviet Republic and Lithuanian Soviet Socialist Republics being established.
 In Belarus the Belarusian People's Republic was conquered and the Socialist Soviet Republic of Byelorussia proclaimed.

Question: What type of gesture does Donets-Krivoy Rog Soviet Republic and have in common?
Answer: signed