The US and Nato have drawn up plans to defend the Baltic nations against Russia, latest US diplomatic cables disclosed by Wikileaks show.
The cables, published in the Guardian, reveal plans to expand existing plans to defend Poland to include Estonia, Latvia and Lithuania.
Wikileaks is releasing hundreds of diplomatic cables, angering the US.
Meanwhile, a warrant for the arrest of Wikileaks founder Julian Assange has reached UK authorities.
Mr Assange, who is believed to be in hiding somewhere in England, is preparing to talk to British police, his lawyer said.
Mr Assange is wanted for questioning in Sweden in connection with rape allegations which he denies.