Seizing the moment, redeployed troops with Putin in charge (13)
I believe the answer is:
opportunistic
'seizing the moment' is the definition.
(making use of an opportunity)
'redeployed troops with putin in charge' is the wordplay.
'redeployed' indicates an anagram (I've seen this in other clues).
'with' is a charade indicator (letters next to each other).
'in charge' becomes 'ic' (abbreviation for 'in charge').
'troops'+'putin'='troopsputin'
'troopsputin' is an anagram of 'opportunist'.
'opportunist'+'ic'='OPPORTUNISTIC'
(Other definitions for opportunistic that I've seen before include "Ready to take any advantage" , "Exploiting openings" , "Exploiting immediate opportunities" , "Exploiting passing advantages" , "Exploitative" .)