"Most likely, we will not block sites, and the entire Autonomous system, where you can find these sites and other platforms not listed in the sanctions".
Yandex, Odnoklassniki and Mail.ru were also in the top five most popular sites that month.
The bans apply for three years.
Ukraine on Tuesday blocked popular Russian social networks and an internet search engine as it expanded sanctions against the Kremlin for its alleged backing of a three-year war in the separatist east.
"VK is also by far the best way for people to share witness accounts for what happens on the frontlines, with detailed timelines".
Yandex is the country's second most popular search engine to Google and the Ukrianian market is VK's second largest after Russian Federation, according to the Kyiv Post.
More than 11 million Ukrainians use the search engine Yandex, a Nasdaq-traded company that posted 14.5 million U.S. dollars (£11.2 million) in net profit in the first quarter of the year.
"We, the VK team, have always avoided politics". "We believe that in its very essence, the internet has no borders".
Numerous Russian movies and television series have been forbidden. The blacklist also covers some books. Ukraine's stand on the issues is supported by Western countries, especially the allegations that Russian Federation had both planned and supported the insurgency in the eastern industrial regions of Lugansk and Donetsk.
Kiev provided no evidence of Russia's involvement in the attack.
The decision sparked an outcry from Ukrainian internet users and freedom of speech advocates.
With relations in tatters, Russian social networks have been used by President Vladimir Putin's government and pro-government groups to promote the Kremlin's position in its standoff with Kyiv and the West over Moscow's interference in Ukraine and other issues.
The tension between the two countries almost overshadowed the Eurovision song contest, which concluded this weekend in Kiev and saw the Portuguese contestant Salvador Sobral emerge victorious.
Russian social media networks Vkontakte (the Russian equivalent of Facebook) and Odnoklassniki were banned.