Other ships/barges can sail in front & astern of it at a safe distance, enforced by security/CG/police boats. Kiel, Panama & Suez canals r being used all the time, not to mention the Bosporus Strait.
Iran can't have foreign bases as per its constitution. Sudan can, but a capital ship won't be forward deployed there. The USN did it in Japan but only with the oldest CVs that were due to retire in ~10 years.
CVNs r different as they must to dance around their refueling schedules that can be done only on US E. Coast & other factors.
BMD can be done as good as or even better in/from the Caspian Sea as it's directly SE/SW & South of Central Russia, W. Siberia & the Urals full of industry, internal waterways/canals, population centers, AF/BM bases, & transportation network.
Last edited by Tsavo Lion on Sun Feb 24, 2019 12:21 am; edited 2 times in total