Belgrade -- along with its key allies China and Russia -- has refused to recognise Kosovo's independence, effectively preventing it from having a seat at the United Nations.

Source: https://www.thehindu.com/news/international/fighting-ongoing-after-police-officer-killed-in-attack-in-north-kosovo/article67342311.ece

Kosovo's highest court has said some parts of the deal were in violation of the constitution and must be changed.

Source: https://www.marketscreener.com/news/latest/Serbia-s-Vucic-says-Kosovo-talks-must-continue-so-they-remain-on-EU-path--42879840/?utm_medium=RSS&utm_content=20230202

On Tuesday, Kosovo's Kurti said he was optimistic about hammering out a deal but put the onus of signing the agreement with Vucic.

Source: https://www.france24.com/en/europe/20230318-serbia-and-kosovo-hold-eu-backed-talks-aimed-at-normalising-ties

Serbia has condemned NATO-led peacekeepers in neighbouring Kosovo for allegedly failing to stop "brutal actions" by Kosovo's police against ethnic Serbs.

Source: https://www.onenewspage.com/n/Front+Page/1zplp48yuq/Brutal-violence-in-Kosovo-condemned-as-Serbia-accuses.htm