Singapore executed three people last week for drug-related crimes, bringing the total number of executions this year to 17.
This is the highest number since 2003.
The executions came just a week before a Singapore court is due to hear a constitutional challenge to the mandatory death penalty for drug-related crimes.
The EU Delegation, as well as the diplomatic missions of EU member states, Norway, Switzerland, and the United Kingdom, condemned the executions of two Singaporeans and a Malaysian citizen, Saminathan Selvaraju.
The Singaporean government has argued that abolishing the death penalty could lead to more serious consequences.
The authorities believe that harsh penalties for drug trafficking have a deterrent effect and prevent drug-related crime, which is a serious problem in other Southeast Asian countries.
Singaporean law defines drug trafficking very broadly, including sale, transfer, transportation, or even use. Courts are required to impose the death penalty for trafficking more than 15g of heroin, 30g of cocaine, 250g of methamphetamine, or 500g of cannabis.