The Indonesian government has already issued a 72-hour warning to 9 convicted drug smugglers from Australia, Brazil, France, Indonesia, Nigeria and the Philippines. They have been asked for their last wishes, according to Attorney General Tony Spontana.

Reuters reported that the government has already informed foreign embassies to send representatives to prison island, as the foreigners' execution is set for this coming Tuesday or Wednesday.

The United Nations Secretary General Ban Ki-Moon, along with several world leaders, is seeking to stop the executions, urging Indonesia's President Joko Widodo to declare a moratorium on capital punishment.

"Under international law, if the death penalty is to be used at all, it should only be imposed for the most serious crimes, namely those involving intentional killing, and only with appropriate safeguards," the secretary general said in a statement released to the press.

But Widodo has remained steadfast on his government's stand. Last January, Indonesia, with its strict drug enforcement law, executed 6 convicted drug traffickers, which included 5 foreigners from Brazil, Malawi, Netherlands and Nigeria.

Meanwhile, foreign leaders continue to urge Widodo to change its policy. The Prime Minister of Australia, Tony Abbot, has already asked for clemency for two its nationals. Andrew Chan and Myuran Sukumaran were convicted of smuggling out heroin from Bali in 2005.

France's President, Francois Holland, on the other hand, said that the execution of its citizen, Serge Atlaoui, could result in grave diplomatic and economic consequences. Atlaoui will have another court hearing on Monday in a last-minute attempt to save him.

President Benigno Aquino from the Philippines will appeal the case of Mary Jane Veloso during the Southeast Asian leaders' summit on Monday.

Relatives and consul officials have been seen arriving at the prison island of Nusakambangan since the weekend for their last visits to the prisoners, who will be executed via firing squad.