I create block with
Set blockTablo = ThisDrawing.Blocks.Add(insertPoint, blockName)
Then I add attributes.
Set blockTabloAttrib = blockTablo.AddAttribute(0.15, mode, "òðàôîïîñò", blockPoint, "ÒÏ", attrTrafopost)
All of source is working fine until now. The new block gets a part of old one. And the attributes are mixed. The value of attributes are written in cyrillic.