Prince Norodom Ranariddh, head of the royalist Funcinpec party, also made an appearance in Kompong Cham.
Ranariddh was to meet an ASEAN delegation later in the day to accept the proposal.
By contrast, the authorities have been rather more zealous and successful in prosecuting Ranariddh's followers.
Ranariddh and Rainsy have both asked demonstrators to stay off the streets while negotiations are underway.
Prince Ranariddh then decided this was an excellent time to scurry off to Paris.
Prince Ranariddh's party enjoys support from those still loyal to his father, King Sihanouk.
ECONOMIST: Hun Sen means to stay in power, by hook or by crook
The trials took place as planned on March 4 and 17, and Ranariddh was predictably found guilty.
Whatever Hun Sen's motivations, the door is now open for Ranariddh's return, tentatively scheduled for March 30.
Last week, the United States suspended aid to Cambodia for 30 days in response to Ranariddh's overthrow.
Some 2, 000 soldiers loyal to Prince Ranariddh were estimated to be involved in the defence of O'Smach.
Their arrival in Phnom Penh, where the royalist party is in disarray, will likely further erode Ranariddh's position.
In an unexpected turnaround, he sent another letter to the king asking for an unconditional pardon for Ranariddh.
Sensing victory, he has already offered Ranariddh a place in the new government.
Prince Ranariddh's return, under a plan negotiated by Japan, nudges Cambodia closer to the election due on July 26th.
Hun Sen's troops have been fighting forces loyal to Ranariddh since the ouster.
Two days later, America did refuse to recognise Ung Huot, partly because his appointment had not received Prince Ranariddh's blessing.
Long-standing animosity and rancour between Hun Sen, Prince Ranariddh and Sam Rainsy are at the root of the current impasse.
In 1997, in Cambodia, Second Prime Minister Hun Sen ousted First Prime Minister Norodom Ranariddh and claims control of the capital.
In his quest for foreign support, Prince Ranariddh now faces a dilemma.
To compete legally in the polls, Ranariddh must cut his military links.
The ousted first prime minister, Prince Norodom Ranariddh, returned briefly from exile.
Prince Ranariddh, at least, stuck to a conciliatory script on his return.
Even without this bizarre scenario, there is the problem of Ranariddh, who most probably will decline to play second fiddle to Hun Sen.
King Norodom Sihanouk would then pardon his son, thereby allowing Ranariddh to return to Cambodia and contest national elections, scheduled for July 26.
The regional club, the Association of South-East Asian Nations, had been trying to broker a settlement between Mr Hun Sen and Prince Ranariddh.
Ranariddh has threatened to withdraw from the coalition government if his partner does not abide by power-sharing arrangements to which they previously agreed.
Bun-Ly's slaying heightened tensions in a capital already troubled by a quarrel between Ranariddh's royalist FUNCINPEC party and Hun Sen's Cambodian People's Party.
After the previous general election, in 1993, Prince Ranariddh was made first prime minister, with Mr Hun Sen sharing power as second prime minister.
Ranariddh is also likely to be deprived of some key followers.
Prince Ranariddh has been touring the world, appealing for help.
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