Censor.NET reports citing presidential website.
Earlier, Poroshenko said that St.George ribbon, which used to be a symbol of Soviet victory in WWII, is now a symbol of the aggression against Ukraine of 2014-2017.
"Russia itself has made this ribbon illegal through its policy in Ukraine," Poroshenko said on May 21.
The law amends Ukraine's Administrative Offense Code with a new article stipulating for liability for production and propaganda of St.George ribbon. Public use of the decoration will lead to a fine.
The law will come into effect the next day after its publication.