Règle correspondante
Practice Relating to Rule 125. Correspondence of Persons Deprived of Their Liberty
Ukraine’s IHL Manual (2004) states:
Within, at the most, 7 days of capture … every prisoner of war shall be enabled to write and send a card of capture … :
one – to his family;
another – to the Central Prisoners of War Agency.
In case of transfer, prisoners of war shall be officially notified of the time of departure and their new postal address. 
Ukraine, Manual on the Application of IHL Rules, Ministry of Defence, 11 September 2004, §