Home1999 Treaties and Agreements ...Ukraine (13074) – Agreement Concerning a Regional Environmental Center in Ukraine hide Ukraine (13074) – Agreement Concerning a Regional Environmental Center in Ukraine TIAS Office of Treaty Affairs December 8, 1999 Environmental and Conservation: Regional Environmental Center Agreement signed at Washington December 8, 1999; Entered into force December 8, 1999. Download Attachment [627 KB] Tags Conservation Environment Treaties Ukraine