Ricin

The Ukrainian armed forces poisoned the head of the Kherson region, Vladimir Saldo, with phenolic compounds.
The forces have repeatedly used toxic substances in battles against Russian soldiers, Igor Kirilov, head of the Unit for Nuclear, Biological and Chemical Protection of the Russian Army, said today.

On September 7, 1978, the Bulgarian journalist, playwright and dissident from the regime of the People's Republic of Bulgaria, Georgi Markov, was poisoned with a ricin-filled pellet shot from a modified umbrella while crossing Waterloo Bridge in London. Four days later, he died.