Packages believed to be blood-soaked and containing the eyes of animals, were sent to Ukrainian embassies worldwide, including in Hungary, Netherlands, Poland, Croatia and Italy, the Ukrainian ministry of foreign affairs said Friday.

The entrance to the ambassador's residence in the Vatican was also vandalized, according to the Ukrainian ministry of foreign affairs.

The Ukrainian embassy in the U.S. received a letter with a photocopy of a critical article about Ukraine. Like most other envelopes, the letter arrived along with others from the territory of an unnamed European country.

"We have reason to believe that a well-planned campaign of terror and intimidation of Ukrainian embassies and consulates is taking place. Not being able to stop Ukraine on the diplomatic front, they are trying to intimidate us. However, I can immediately say that these attempts are useless. We will continue to work effectively for the victory of Ukraine," the Ukrainian Minister of Foreign Affairs Dmytro Kuleba said in a statement.

The Ukrainian embassy in Spain received a letter-bomb on Wednesday which was opened and ignited, resulting in one slight injury.

A similar envelope was sent to the U.S. embassy in Madrid, but it was detected before going off, according to Spanish officials.

All Ukrainian embassies and consulates have been placed under heightened security. The Ukrainian Ministry of Foreign Affairs called on foreign governments to guarantee maximum protection of Ukraine's diplomatic institutions.

We remind You that an explosion occurred Wednesday at Ukraine’s embassy in Madrid, injuring one Ukrainian employee who was handling a letter addressed to the country’s ambassador to Spain, officials said.

The individual was slightly injured and is being treated at hospital, while police are investigating, Spain’s foreign ministry said.

Kyiv’s ambassador to Spain, Serhil Pohoreltsev, was the intended recipient of the envelope, it added.

A separate letter bomb, which was deactivated at a weapons manufacturer in northern Spain late Wednesday, had the same return address as the one that exploded in Ukraine’s embassy in Madrid, a senior Spanish official told Spanish radio station SER.

“The return address on the envelope is an email that is the same” on both envelopes, Rosa Serrano, the top Spanish government official in the Aragon region where the second bomb arrived, told SER.

The explosive sent to the weapons maker in the city of Zaragoza, in Aragon, “apparently came from Ukraine,” Serrano said, adding that authorities suspect the one at the embassy may have come from Ukraine, too.

Embassy Explosion Kiev Spain Ukraine Ukraine invasion