The issue focused attention on concerns raised about cyberattacks during last week's elections and cybersecurity amid heightened tensions between Russia and the West over Moscow's annexation of Crimea from Ukraine and backing for separatist rebels in eastern Ukraine.

Foreign ministers meeting at the Kremlin warned Putin against intervening militarily in Ukraine but praised Moscow's willingness to cooperate with Kiev on combating Islamist insurgents who seized swathes of territory last month in what NATO calls "Operation Protective Edge".

Ukraine said Wednesday it would suspend preparations for hosting an upcoming Nato summit