The Skripals spent days in a coma before recovering but local resident Dawn Sturgess died after picking up a discarded perfume bottle allegedly used to carry the poison.
The United States, EU members, NATO and other nations expelled over 150 Russian diplomats in a coordinated action against Moscow over the Skripal case, leading to tit-for-tat reactions from Moscow.
Navalny's poisoning comes after a daylight murder of a former Chechen rebel commander in a Berlin park in August last year, which German prosecutors believe was ordered by Russia.
Merkel had also revealed in May that Russia had targeted her in hacking attacks, saying she had concrete proof of the "outrageous" spying attempts.
(Writers: Hui Min Neo, Anna Malpas)
Source: http://u.afp.com/3b47
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