[10] Later he moved to Geneva, Switzerland, where he studied chemistry but due to the lack of money he returned to Sofia after one year.

[citation needed] During the Balkan Wars, he and other former IMARO revolutionaries, such as Petar Poparsov and Rizo Rizov, met with Dimitrija Čupovski, they would make an appeal to the local residents from Veles which would be sent to the London Conference, demanding autonomy for Macedonia.

[24] On the eve of the Second Balkan War in 1913, he was sent by Todor Aleksandrov on a reconnaissance mission in the area of Macedonia controlled by Serbia.

[6][32][33] In 1931, together with Hristo Traykov, he was threatened with physical violence by Ivan Mihaylov's IMRO faction, because he spread communist ideas among the Macedonian emigration in Bulgaria.

Hristo Traikov was killed by activists of Ivan Mihailov's wing who also worked with Aleksandar Protogerov such as Pavel Karakashev,[34] but Martulkov escaped with only injuries.

[35][36][37] On June 14, 1932, in Sofia Martulkov and Naumov published the first article of the newspaper "Macedonian Flag" (Makedonsko Zname) which was an organ of the IMROU for immigrants from Macedonia in Bulgaria,[38] he published an issue once a week and the newspaper lasted between 1932 and 1934 when it would be eventually banned after the 1934 military coup in Bulgaria.

[41] The newspapers program was mostly focused on helping out and promoting socialist and pro-Macedonian views amongst the immigrants in Blagoevgrad province and some in Sofia.

The court characterized the organization as anti-state and pro-communist one, aiming through an armed uprising to change the state system and harm the territorial integrity of the country.

[45] Before the annexation of Yugoslav Macedonia by Bulgaria[49][50] in the spring of 1941, he participated in a group of like-minded activists who initiated the creation of Bulgarian Action Committees there.

[56] Later Martulkov, as many of the older left-wing IMRO government officials,[57] was removed from his high position, and then isolated.

At the end of his life, disappointed with the policy of the new authorities in Yugoslavia,[43] Martulkov returned to Sofia, where he died on 19 December 1962.

In the book Martulkov gives a detailed biography of his life and early childhood and his troubling experience with the Ottoman authorities in Istanbul.

[61] He also writes about how he met Pavel Shatev and other boatmen of Thessaloniki, how he helped organizing the Ilinden Uprising in the Veles and Kumanovo regions under the Skopje revolutionary district