Critics have accused

Ukrainian President Petro Poroshenko of engaging in clandestine diplomacy

during peace talks with Russia, but others have dismissed this criticism as

unfounded.

The debate followed the

publication by Dzerkalo Tyzhnya on Jan. 23 of what it said was a secret

addendum to the Sept. 19 Minsk memorandum outlining the terms for a cease-fire

between Ukraine and Kremlin-backed mercenaries and insurgents.