Sinn Féin President Gerry Adams has urged the Spanish government "to grasp the opportunity" of ETA's ceasefire announcement.
The Basque separatist group has released a video announcing a ceasefire.
In the clip released to Basque TV, members of the group say they want to hold talks on independence with the Spanish government.
Mr Adams said: "I welcome the announcement made today by ETA to pursue Basque independence through peaceful and democratic means.
"This is a significant statement and has the potential to bring about a permanent end to the long-running conflict in the Basque country.
"It is now vital that the Spanish government respond positively and grasp the opportunity to advance a peace process presented by today’s announcement and quickly establish inclusive political negotiations."