Russia restarts sharing radiation data, big questions linger

Russia has resumed sharing data from radiation monitoring stations in Siberia after some were taken offline following a deadly explosion at a missile range, an nuclear weapons watchdog said Tuesday, while an American expert said the fact that more than one Russian site went offline at the same time suggests it was not the work of Mother Nature.

The Comprehensive Nuclear Test Ban Treaty Organisation (CNTBTO) said earlier this week that several Russian radiation monitoring stations went silent shortly after the Aug. 8 explosion at the Russian navy's testing range in northwestern Russia.

Lassina Zebro, the organisation's executive secretary, said Tuesday on Twitter that the two Russian stations reported to be offline are back in operation and are now backfilling the data.

He lauded Moscow for its "excellent cooperation." William Tobey, a former deputy administrator at the US National Nuclear Security Administration, said it was "at least an odd coincidence" that the Russian sensors stopped transmitting data about the same time as the explosion occurred.

Although the explanation could be innocuous "the fact that it was from more than one site seems to make that less likely," said Tobey, a senior fellow at the Belfer Center for Science and International Affairs at Harvard's Kennedy School of Government.

"Power outages, other failures, can knock down a particular place, but if more than one site is out, it would seem that that is a less likely explanation," he added.

Russian authorities have offered changing and contradictory information about the explosion at the testing range in Nyonoksa on the White Sea, fuelling speculation about what really happened and what type of weapon was involved.

While the Russian Defense Ministry said no radiation had been released in a rocket engine explosion, officials in the nearby city of Severodvinsk reported a brief rise in radiation levels.

The contradiction drew comparisons to Soviet attempts to cover up the 1986 explosion and fire at the Chernobyl nuclear power plant in Ukraine, the world's worst nuclear disaster.

In his first comments on the explosion, Russian President Vladimir Putin said Monday that it hasn't posed any radiation threat.

Putin added that experts are monitoring the situation to prevent any "any unexpected developments."
He didn't say what weapon was being tested when the explosion occurred, but described the test as a "state mission of critical importance."
Rosatom said the explosion occurred on an offshore platform during tests of a "nuclear isotope power source."