Several Russian military officials have been arrested in the past months. What is happening?

President Vladimir Putin on Wednesday lauded Moscow's nuclear arsenal and warned that he was ready to deploy the weapons if Russia's sovereignty was threatened. Source: AP / Alexei Nikolsky
In Russia, the former commander of the 58th Army was arrested in a corruption case. This is not the first time a military official has been arrested in the recent months. Does this mean that the Kremlin has begun a purge of the leadership of the armed forces?
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