some of link is not working any more.

UFO Open by different country's government and it’s agency
1989 : Russia Open UFO files.  Japanese “Soviet Union Today” Magazine.
1992  : Spain, The UFO secret archives guarded for years by Spanish military force were declassified. That was one of the most important event during the Spanish UFO research between 1947 and 1997.
1997 - 2007-2009 : Chile's government organization CEFAA -- [Comite De Estudios De Fenomenos Aeros Anomalos] translated into English, "The Committee for the Study of Anomalous Aerial Phenomena." .
2003 - Nov, 2005 April : Finland , Finnish officials have filmed UFOs by infrared video at least twice. The Finnish UFO Research Association FUFORA has received the videos for further analysis.
2004 - 5 Oct : Mexican Air force open UFO files in Oct 5, 2004.
2005 - 20 May : Brazilian Air Force (FAB) open UFO files in Friday.
2007 -22 March : France space agency (cnes) open UFO files.
2007 - Oct : MOD = British Ministry of Defense open UFO files ( 12,000 files this 50 years ).
( NO 1: 14 May 2008, NO 2: Oct 2008, NO 3: March 2009, NO 4:Aug 2009, NO 5: Feb 2010, NO 6: Aug 2010. NO 7: March 2011. NO 8: 11 Aug 2011. NO 9: 17 July 2012. NO 10: June 2013, however MOD decided closes UFO hotline on 1 December 2009. MOD page. Still we can access UFO archives at UK government national archives.).
2008 - 13 May : In the Vatican newspaper piece, titled "The Extraterrestrial Is My Brother," the Rev. Jose Gabriel Funes said the expansiveness of the universe means there could be life on planets other than Earth.
2009 - 29 Jan : Denmark Air Force. UFO Disclosure.
2009 - 20 Feb : Canada open UFO X files: Oct 29 2007
2009 - 4 May : Brazilian Government disclosed over 600 UFO new pages. new April 2013
2009 - 9 May : Sweden disclosing 18000 UFO x-files.
2009 - 24 June : Uruguayan air force declassifies UFO files.
2009 - 21 July : Russian navy has declassifies UFO files. new Feb, July 2013.
2010 - 27 Sep : United Nations.The United Nations Office of Outer Space Affairs (UNOOSA) has announced that it will consider drafting protocols for what to do when we finally make contact with extra-terrestrial civilizations in space. What's prompting the UN to consider this possibility is the fact that astronomers are expected to announce, perhaps later this year or next year, that our satellites (such as Kepler and Corot) have identified earth-like planets in space.
2010 - 22 Dec : New Zealand military, hundreds of classified UFO reports released.
2010 - 29 Dec : The Argentinean Air Force (AAF) UFO reports.
2011 - 19 Feb : Chile’s Office of Civil Aeronautics : Comité de Estudios de Fenomenos Aereos Anómalos (CEFAA)
2012 - 5 Aug : Australia National Archives : Australia’s secret UFO files released. new May 2013.
2013 : Ukraine.
2013 - 18 Oct : Peruvian Air Force (FAP) announced re-instate their UFO department : Office of Anomalous Aerial Phenomena Research (OIFAA). OIFAA originally opened 2001-2005.
2015 - 20 Jan: US Air Force 130,000 pages UFO : Project Blue book document open by Freedom of Information Act (FOIA)

in USA, CIA and FBI has UFO page also.
2007 - 18 November : Japanese government official say UFOs exist.

22Oct2022

NASA Announces Unidentified Aerial Phenomena Study Team Members

https://www.nasa.gov/feature/nasa-announces-unidentified-anomalous-phenomena-study-team-members/