Russia officially joins Turkey’s Black Sea Harmony initiative to address new security challenges in region.
Actually this happened in the end of December, but I just found my bookmark today :)

Black Sea Harmony is a naval operation initiated by Turkey in March 2004 in accordance with UN Security Council Resolutions 1373, 1540 and 1566 aimed at deterring terrorism and asymmetric threats worldwide. (Wikipedia)

Ukraine has also announced last year that it is considering joining Black Sea Harmony, and the last i’ve read Ukraine’s participation process is in its final stage.