MOSCOW — A bomb exploded Wednesday evening on a street in Kiev, Ukraine’s capital, wounding a prominent politician and killing his bodyguard in the latest in a series of elaborate assassination plots in the city.

The Ukrainian authorities have mostly blamed the Russian secret services for plotting the killings — which were carried out with bombs and in one case by an assassin who got close to his targets through a sophisticated ruse — although the police suggested that one recent bombing was related to an organized crime dispute.

The politician wounded on Wednesday, Ihor Mosiychuk, a populist member of Parliament with the far-right Radical Party, had just stepped out of a television studio after giving an interview; the explosives were set off as he exited the building. A political commentator, Vitaliy Bala, who had appeared with Mr. Mosiychuk in the interview, was also wounded.

Image Ihor Mosiychuk, member of Parliament with the far-right Radical Party, was wounded in the attack. Credit... Stepan Franko/European Pressphoto Agency

Oleh Lyashko, the leader of the Radical Party, told local news media that Mr. Mosiychuk had been singled out for his “political positions,” and that “it is obvious this is the work of enemy special services, because the job was professional.”