Russia has made major renovations to what appears to be an active nuclear weapons storage site in Kaliningrad, Russian territory between Poland and the Baltics, according to the Federation of American Scientists.
Satellite images reveal one of three underground bunkers were excavated in 2016 for what apparently was a major modernization and covered up again in 2018.
The Federation said the work raises questions about the operational status of the facility, including whether it signals a new development of Russian nuclear weapons strategy in that region.
The site could potentially serve Russian Air Force on Navy dual-capable forces, but could also be a joint site servicing nuclear warheads for both the Navy and Air Force, the Federation noted.
The report on the federation's web site comes from Hans Kristensen, director of the Nuclear Information Project for the organization.
The site was last upgraded between 2002 and 2010.
And the federation noted that during the Cold War, Russia had deployed dual-capable forces in Kaliningrad and has continued to do so.
The report said the Russians have made similar upgrades to other nuclear weapons storage sites over the last decade. And other non-nuclear storages sites in the Kaliningrad region have also been modernized.
CNN noted Kaliningrad is an isolated pocket of sovereign Russia on the Baltic coast. It said Russia has not commented on any upgrades at the site, but has defended its right to deploy weapons there in the past.
And the news network said the upgrades come as tensions in Eastern Europe have been mounting since Russia's annexation of Crimea from Ukraine.
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