"After the alleged nuclear test by North Korea no excesses in background radiation levels were detected on the territory of the Primorsky region," local state monitoring service Primgidromet said in a statement.
"The radiation situation remains stable," the statement said, adding that "the level in the region remains within the normal range."
Neighbouring North Korea declared itself a thermonuclear power on Sunday, after carrying out a sixth nuclear test more powerful than any it has previously detonated, presenting President Donald Trump with a potent challenge.
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