For offsprings.
How I managed to add russian language to fpdf on my Linux machine:
1) Go to http://www.fpdf.org/makefont/ and convert your ttf font(for example AerialRegular.ttf) into 2 files using ISO-8859-5 encoding: AerialRegular.php and AerialRegular.z
2) Put these 2 files into fpdf/font directory
3) Use it in your code:
$pdf = new \FPDI();
$pdf->AddFont('ArialMT','','ArialRegular.php');
$pdf->AddPage();
$tplIdx = $pdf->importPage(1);
$pdf->useTemplate($tplIdx, 0, 0, 211, 297); //width and height in mms
$pdf->SetFont('ArialMT','',35);
$pdf->SetTextColor(255,0,0);
$fullName = iconv('UTF-8', 'ISO-8859-5', '???????');
$pdf->SetXY(60, 54);
$pdf->Write(0, $fullName);