not acceptable to both Belgrade and Pristina. On 17 February 2008 Kosovo unilaterally declared its independence, and subsequently adopted the Constitution of Republic of Kosovo, which came into effect on 15 June 2008. Some Kosovo Serbs opposed to secession boycotted the move by refusing to follow orders from the central government in Pristina and attempted to seize infrastructure and border posts in Serb-populated regions. There have also been sporadic instances of violence against international institutions and governmental institutions, predominantly in Northern Kosovo (see 2008 unrest in Kosovo). On July 25, 2011, Kosovan Albanian police wearing riot gear attempted to seize several border control posts in Kosovo's Serb-controlled north trying to enforce the ban on Serbian imports imposed in retaliation of Serbia's ban on import from Kosovo. It prompted a large crowd to erect roadblocks and Kosovan police units came under fire. An Albanian policeman died when his unit was ambushed and another officer was reportedly injured. Nato-led peacekeepers moved into the area to calm the situation and Kosovan police pulled back. The US and EU criticised the Kosovan government for acting without consulting international bodies. Some rapprochement between the two governments took place on 19 April 2013 as both parties reached the Brussels Agreement, an agreement brokered by the EU that allowed the Serb minority in Kosovo to have its own police force and court of appeals. The accord was ratified by the Kosovo assembly on 28 June 2013. In April 2021, Kosovo parliament elected Vjosa Osmani as new president for a five-year term. She was Kosovo's seventh president, and the second female president, in the post-war period. Osmani had the backing of the left-wing Self-Determination Movement (Vetevendosje) of Prime Minister Albin Kurti, which won the February 2021 parliamentary election. In September 2021, Serbs from Kosovo's north had blocked two main roads, protesting a ban on cars with Serbian licence plates entering Kosovo without temporary printed registration details. Two interior ministry buildings in northern Kosovo, including a car registration office, were attacked. Serbia began military manoeuvres near the border and started flying military jets above the border crossing. Kosovo's NATO mission stepped up patrols near border crossings. On September 30, 2021, an agreement between Kosovo and Serbia was reached to end the stand-off. Kosovo agreed to withdraw police special forces. In late July 2022 tensions flared up again when the Kosovo government declared that Serb-issued identity documents and vehicle licence