This year, Euskal Herritarrok received 14 deputies in the Basque parliament with 18% of popular support (one of the highest ever for the nationalist left). In 1999, it signed a pact in support of the government of Juan José Ibarretxe (EAJ-PNV). The agreement was broken in 2000 after the failure of a one-year ceasefire under ETA (see: Lizarra Agreement), for which they accused each other of being responsible. This agreement proposed a common position on the defence of Basque self-determination. The key chapter of the resolution states that Otegi played a key role in formulating what was to be known as the Lizarra-Garazi Agreement or the “Estella-Lizarra Declaration.” This agreement was concluded on 12 Ezker Batua (EB), the Basque branch of the Spanish Izquierda Unida (United Left), signed in Estella-Lizarra on 7 September 1998 by all political parties linked to Basque nationalism in the south of the Basque Country.  These groups collaborated by understanding that “discussions would only take place if all expressions of conflict-related violence were totally missing.”  In the 1998 Basque legislative elections, Arnaldo Otegi ran and won as a candidate for Euskal Herritarrok in the Gipuzkoa constituency. The Lizarra-Garazi agreements allowed Euskal Herritarrok to achieve the best electoral result in ten years and became the third political party in the Basque Country and the region bordering Navarre. This popularity in terms of votes was reversed when ETA decided to end the ceasefire in 1999 and killed Pedro Antonio Blanco in 2000. ETA accused the Basque Nationalist Party (PNV) of failing to implement the Lizarra-Garazi agreements and the PNV accused ETA. The end of the ceasefire was condemned by all signatories to the Lizarra-Garazi agreements, with the exception of Herri Batasuna.
This refusal to condemn the violence put an end to the agreements. After these events, Herri Batasuna began a new process of debate that ended with the formation of Batasuna and the split of Aralar. In November 2018, the European Court of Human Rights condemned Spain for violating the defendants` right to an impartial trial that it did not have. As Arnaldo Otegi explained: In May 2005, Arnaldo Otegi was tried for belonging to ETA, but released on bail of 400,000 euros. Shortly thereafter, a Spanish Supreme Court ruling upheld Otegi`s 15-month prison sentence for “glorifying terrorism” in a case brought against him for a speech against him in 2003 in memory of the murder of a prominent ETA member 25 years earlier. . . .