Academic literature on the topic 'Able Archer 83'

Did the Cold War of the 1980s nearly turn hot? Much has been made of the November 1983 Able Archer 83 command-post exercise, which is often described as having nearly precipitated a nuclear war when paranoid Warsaw Pact policymakers suspected that the North Atlantic Treaty Organization (NATO) was using the exercise to launch a preemptive nuclear strike. This article challenges that narrative, using new evidence from the archives of the former Warsaw Pact countries. It shows that the much-touted intelligence effort to assess Western intentions and capabilities, Project RYaN, which supposedly triggered fears of a surprise attack, was nowhere near operational at the time of Able Archer 83. It also presents an account of the Pact's sanguine observations of Able Archer 83. In doing so, it advances key debates in the historiography of the late Cold War pertaining to the stability and durability of the nuclear peace.

ABSTRACT“CandidatusMethanoperedens nitroreducens” is an archaeon that couples the anaerobic oxidation of methane to nitrate reduction. In natural and man-made ecosystems, this archaeon is often found at oxic-anoxic interfaces where nitrate, the product of aerobic nitrification, cooccurs with methane produced by methanogens. As such, populations of “Ca. Methanoperedens nitroreducens” could be prone to regular oxygen exposure. Here, we investigated the effect of 5% (vol/vol) oxygen exposure in batch activity assays on a “Ca. Methanoperedens nitroreducens” culture, enriched from an Italian paddy field. Metagenome sequencing of the DNA extracted from the enrichment culture revealed that 83% of 16S rRNA gene reads were assigned to a novel strain, “CandidatusMethanoperedens nitroreducens Verserenetto.” RNA was extracted, and metatranscriptome sequencing upon oxygen exposure revealed that the active community changed, most notably in the appearance of aerobic methanotrophs. The gene expression of “Ca. Methanoperedens nitroreducens” revealed that the key genes encoding enzymes of the methane oxidation and nitrate reduction pathways were downregulated. In contrast to this, we identified upregulation of glutaredoxin, thioredoxin family/like proteins, rubrerythrins, peroxiredoxins, peroxidase, alkyl hydroperoxidase, type A flavoproteins, FeS cluster assembly protein, and cysteine desulfurases, indicating the genomic potential of “Ca. Methanoperedens nitroreducens Verserenetto” to counteract the oxidative damage and adapt in environments where they might be exposed to regular oxygen intrusion.IMPORTANCE“CandidatusMethanoperedens nitroreducens” is an anaerobic archaeon which couples the reduction of nitrate to the oxidation of methane. This microorganism is present in a wide range of aquatic environments and man-made ecosystems, such as paddy fields and wastewater treatment systems. In such environments, these archaea may experience regular oxygen exposure. However, “Ca. Methanoperedens nitroreducens” is able to thrive under such conditions and could be applied for the simultaneous removal of dissolved methane and nitrogenous pollutants in oxygen-limited systems. To understand what machinery “Ca. Methanoperedens nitroreducens” possesses to counteract the oxidative stress and survive, we characterized the response to oxygen exposure using a multi-omics approach.

Able Archer 83 was one in a series of NATO exercises designed to test processes, troop movements, secondary missions and tactical nuclear strike against chosen Soviet Bloc targets. The Soviets grew fearful that it was cover for an actual assault. The situation was precarious, perilously close to what generations of analysts considered the most likely cause of a hot war: miscalculation. Fortunately British intelligence had recruited a Soviet intelligence officer, Oleg Gordievsky, who could provide crucial insights, allowing for leaders to offer reassurances and tode-escalate. Documents: Indicators to recognize adversarial preparations for a surprise nuclear missile attack; Implications of Recent Soviet Military-Political Activities.