Ukraine and Russia's relationship has reached its lowest point since the collapse of the Soviet Union.
The National Front leader said she did not view the annexation of Crimea as illegal.
Kiev's SBU claims a Ukrainian national was attempting to recruit a double agent in the army.
Kiev says FSB agents and Russian armed forces shot at each other.
Ukraine's security chief angered Moscow with suggestions of Russian responsibility.
Moscow's spy agencies have started a campaign of bomb attacks to create panic and instability across Ukraine.