This is stated in the summary statement of the EU Foreign Service, according to German newspaper Süddeutsche Zeitung.
According to the publication, Putin stated this in conversation with Ukrainian President Petro Poroshenko.
Poroshenko, in turn, passed on the conversation to President of the European Commission Jose Manuel Barroso.
"If I wanted to, in two days I could send the troops not only into Kyiv, but also to Riga, Vilnius, Tallinn, Warsaw and Bucharest", Putin said to Poroshenko.
In addition, according to the German newspaper, Putin advised the Ukrainian President "not to rely too much on the EU," since he can if he wants to "influence and block a decision by the European Council."