I would like to add 2 social network (vk.com + ok.ru) counters to the “sharing”-sidebar. How can I do that?

Well of course you can , here is the guide for you then 😀 First of all , you need to open the functions.php file in your theme and pls add those code below : 
( note : vk –> vk.com , ok –> ok.ru )
Step 1 :
Find in line 434 : function dw_focus_post_actions() : add these code : 
$vk_count = dw_get_vk_share_count( get_permalink() ); 
$ok_count = dw_get_ok_share_count( get_permalink() );
Step 2 :
and after that you will add some HTML code in:
to show the share button in front end like this

<li class="vk-share">
 <i class="icon-linkedin-sign"></i>
 <a href="http://vkontakte.ru/share.php?url=<?php echo $url; ?>" target="_blank"><?php _e('VK','dw_focus') ?></a><span class="digit digit-linkedin"><?php echo $linkedin_count ?></span>
 </li>
 <li class="ok-share">
 <i class="icon-vk-sign"></i>
 <a href="http://www.odnoklassniki.ru/dk?st.cmd=addShare&st._surl=<?php echo $url; ?>"><?php _e('OK','dw_focus') ?></a>
 <span class="digit digit-linkedin"><?php echo $ok_count ?></span>
 </li>

Then your “share” button will show at the front-end , then of course you need to style it ( icon for vk.com and ok.ur ( you can find it on google ) and the back ground for counter color of those site )
Step 3 : now this is the important part to make the counter work ! 

You need to add 2 functions for $vk_count and  $ok_count
Find the zone that contain function ” dw_get__count ” and add this 2 near there 😀 
 for vk.com share counter:

if (! function_exists('dw_get_vk_share_count')){
  function dw_get_vk_share_count($url) {
  $tempvk = dw_file_get_content( 'http://vk.com/share.php?act=count&url=' .$url);
  $tmpvk = array();
  preg_match( '/^VK.Share.count\(0, (\d+)\);$/i', $tempvk, $tmpvk );
  $tempvk_count = $tmpvk[1];
  return isset( $tempvk_count ) ? $tempvk_count : 0;
 }
}

 for ok.ru share counter :

if (! function_exists('dw_get_ok_share_count')){
  function dw_get_ok_share_count($url) {
  $tempok = dw_file_get_content( 'http://ok.ru/dk?st.cmd=extLike&uid=odklcnt0&ref=' .$url );
  $tmpok = array();
   preg_match('/^ODKL\.updateCount\(\'odklcnt0\',\'(\d+)\'\);$/i', $tempok, $tmpok );
  $tempok_count = $tmpok[1] ;
  return isset( $tempok_count ) ? $tempok_count : 0;
 }
}

Well good luck then 😀 

I’ve tried it, but the counters don’t work. I have “Fatal error: Call to undefined function” in the sidebar & “dw_get_vk_share_count() in ***\wp-content\themes\dw_focus_1.0.9_theme\functions.php on line 438” in the footer.
Could you check the summarized part of this code?

if( ! function_exists('dw_focus_post_actions') ) {
    /**
     * Display Social Share, Print, Sent Button
     */
    function dw_focus_post_actions() { 
        $post_id = get_the_ID(); 
        $url = rawurlencode( get_permalink() );
        $title = rawurlencode( get_the_title() );
        $vk_count = dw_get_vk_share_count( get_permalink() );

            if (! function_exists('dw_get_vk_share_count')){
                function dw_get_vk_share_count($url) {
                $tempvk = dw_file_get_content( 'http://vk.com/share.php?act=count&url='.$url);
                $tmpvk = array();
                preg_match( '/^VK.Share.count\(0, (\d+)\);$/i', $tempvk, $tmpvk );
                $tempvk_count = $tmpvk[1];
                return isset( $tempvk_count ) ? $tempvk_count : 0;
                }
            }

        $ok_count = dw_get_ok_share_count( get_permalink() );

            if (! function_exists('dw_get_ok_share_count')){
                function dw_get_ok_share_count($url) {
                $tempok = dw_file_get_content( 'http://ok.ru/dk?st.cmd=extLike&uid=odklcnt0&ref='.$url );
                $tmpok = array();

                preg_match('/^ODKL\.updateCount\(\'odklcnt0\',\'(\d+)\'\);$/i', $tempok, $tmpok );
                $tempok_count = $tmpok[1] ;
                return isset( $tempok_count ) ? $tempok_count : 0;
                }
            }

        $twitter_count = dw_get_twitter_count( get_permalink() );
        $facebook_count = dw_get_facebook_count( $url );
        $linkedin_count = dw_get_linkedin_count( get_permalink() );
        $gplus_count = dw_get_plusones_share_count( get_permalink() );

    ?>

Hi Anton 

U should add 

 $vk_count = dw_get_vk_share_count( get_permalink() );
$ok_count = dw_get_ok_share_count( get_permalink() );

after 

$gplus_count = dw_get_plusones_share_count( get_permalink() );

Hope this help!