LONDON, April 20 - Moody's Investors Service assigned a B1 rating on Tuesday to the senior unsecured loan participation notes of Ukraine's Ukreximbank, the agency said in a statement.

The statement said: "The size of the issue is $500 million, and the notes will be issued for the period of five years on a limited-recourse basis by Biz Finance PLC, a UK-based special purpose vehicle, for the sole purpose of funding loans to Ukreximbank.