Regarding Yantar voyage: I've been doing some research.
July -Olenya Bay (home port)
Aug -Lisbon Portugal
Sept -Canaries (sick crew member rescued to Spain), Aegean, Bosphorus (North)
Oct -Sevastopol, Bosphorus (South), Latakia
Nov -Oman, Off Busheir & Bandar Abbas Iran, Syria Mig-29 recovery
Dec -Limmasol Cyprus, Syria, Pillars of Hercules (West)
Jan -English Channel (North), off Cherburg
March -Syria Su-33 recovery (must be incorrect as seems to have returned to Olenya Bay)
??? returned to Olenya Bay
Aug -Bay of Biscay, Lisbon
Sep -Pillars of Hercules (East), off Benghazi Libya, off Lebanon, Syria fighter spot again, Lebanon again, Bosphorus (North)
Oct -Sevastopol, Novorossyk, Bosphorus (South), Syria/Lebanon, Suez, Seychelles, Mauritius
Nov -Cape Town divert to sub hunt while off Namibia/Angola
Dec -Sub hunt, Buenos Aires, sub hunt
Jan -Buenos Aires
April -Pillars of Hercules (East), Latakia Su-30 recovery
May -Pillars of Hercules (West)
June -English Channel (North)
Sources: Balancer, Charly015, @steffanwatkins twitter, Covert Shores & various news reports
Seems there was a return to North early 2017 I hadn't previously picked up on so this was 2 separate missions not 1 epic.
Two visits to Sevastopol makes it arguably 3 or 4 but they seem to have been very short stays, maybe picking up spares/specialists?
Yantar crew must have racked up a huge amount of experience (also including their 2015 NA/Carribean mission) but I bet they're really looking forward to the 2nd of the class coming into Service.
Hangouts off Portugal (technically NATO but still friendly enough to allow Russian ships to dock), Libya, Syria, Lebanon/Cyprus, Iran & South Africa indicate primary mission of delousing friendly cables from US bugs rather than attack against Western cables.
Interestingly found dates to the infamous case off Syria of Turkey <-> Cyprus cable, contrary to Western media who implied Yantar cut the cable, it actually arrived after the cable went down, left before it came back online.
Similarly off Iran it arrived after cable problems started, sprinted from Oman to arrive on site.
And when off Lebanon/Cyprus in 2017 after hanging around for a while a Turkish cable ship was dispatched to same location with a new length of cable before Yantar left.