He shared the information in an interview with CNN.
“This campaign is aimed at sowing fear,” Dmytro Kuleba told CNN.
According to CNN, their reporter in Kyiv was shown an image of one of the letters containing what officials said was the eyeball of a pig inside a padded envelope.
“It started with an explosion at the embassy of Ukraine in Spain. But what followed this explosion was more weird, and I would even say sick,” said Kuleba.
When CNN asked Kuleba who he thought was behind the letters, he answered, “I feel tempted to say, to name Russia straight away, because first of all you have to answer the question, who benefits?”
“Maybe this terror response is the Russian answer to the diplomatic horror that we created for Russia on the international arena, and this is how they try to fight back while they are losing the real diplomatic battles one after another,” he continued.
Kuleba added that, in his opinion, Russia is either directly responsible or someone "“who sympathizes [with] the Russian cause and tries to spread fear."
“The conclusion will be made by investigators, but I think these two versions make most of the sense,” he concluded.