In January 1999, they were frozen for four months, until Mr Pastrana sacked two generals.
His campaign has been endorsed by Mr Pastrana's party, as well as sections of the Liberals.
Mr Pastrana struggled to convince Mr Clinton's officials of the wisdom of his peace plan.
Mr Pastrana has staked too much on the peace process to turn back now.
Yet Mr Pastrana will have to overcome suspicion, cynicism and allegiances built up over generations.
Colombian President Andres Pastrana, on his own and with American encouragement, continued that fiction.
Its president, Andres Pastrana, says the plan will cut drug production in half within five years.
On top of all the other problems, Mr Pastrana's government must deal with an economic slump.
It undermined Mr Pastrana's claim to broad national backing in his dealings with the guerrillas.
Mr Pastrana, a fierce critic of the president, flatly said no, indeed said it five times.
ECONOMIST: That��s this Sunday, and the run-off rivals are neck and neck
Mr Pastrana has aligned Colombia even more closely with the United States' war on drugs.
Certainly he was widely considered to be one of Mr Pastrana's more able ministers.
One of Mr Pastrana's achievements has been to involve outsiders in trying to settle Colombia's conflicts.
ECONOMIST: Colombia's conflicts: Enemies of the state, without and within | The
And in a second round Mr Pastrana could well hope and polls agree to pick up the independent vote.
Harold Bedoya, former chief of the armed forces, has told his few 200, 000 first-round voters to back Mr Pastrana.
ECONOMIST: That��s this Sunday, and the run-off rivals are neck and neck
The National Front was ended in 1974 after Pastrana senior's administration, but by then it was too late.
However the talks go, Mr Pastrana must continue his efforts to create a stronger and more professional army.
President Andres Pastrana has just pushed into retirement two generals repeatedly accused of collaboration with illegal paramilitary groups.
His supporters argue that Mr Pastrana has emerged from all this with a stronger grip over the army.
Mr Lampreia says that Brazil would have no problems if Mr Pastrana asked the summit to support his plan.
Mr Pastrana has only four years in which to achieve results: the constitution bars him from a second term.
ECONOMIST: Peace in Colombia? This year, next year, sometime...
With killing and kidnapping and massacres by the paramilitaries all continuing, public confidence in Mr Pastrana's peace process has fast diminished.
The weak economy and the plummeting peso blamed variously on Asia, Mr Samper, and manipulation by Pastrana-supporting businessmen have also featured prominently.
ECONOMIST: That��s this Sunday, and the run-off rivals are neck and neck
Mr Pastrana will have to overcome his generals' dislike of demilitarising the wide rural areas that the guerrillas speak of.
Mr Pastrana still has 14 months of his term left, but already attention is shifting to next year's presidential election.
But even if Mr Pastrana now has a closer hold on the armed forces, his political strategy is in disarray.
Under Mr Pastrana, only commercial coca plantations, of three hectares or more, rather than family farms were supposed to be sprayed.
Under pressure from human-rights groups, Mr Pastrana's government has pledged to break the links between the armed forces and the paramilitaries.
Mr Pastrana's modest increases in military spending have gone mainly on wages and pensions, according to Alfredo Rangel, a defence analyst.
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