He said East Germany had no intention of entering NATO under its current doctrine, presumably a reference to its cold war roots.
Eastern European leaders say they want to stay on Washington's good side, particularly as they try to enter NATO.
Bill Clinton won Polish-American support for helping Poland enter NATO in 1996.
They discuss topics such as family violence, drug prohibition, entering NATO and violence in Guantanamo bay.
The political confrontation could slow Estonia's preparations to enter NATO later this year and the European Union in 2004.
Their support is a sign of gratitude for Washington's efforts to help them enter NATO.
Portugal, still under its dictator Antonio Salazar, entered NATO.
A desire to enter the European Union and NATO propelled both countries to negotiate the treaty.
Former Warsaw Pact nations, eager to enter NATO, are obliged to increase the amount they devote to defense.
During the party's term, Bulgaria entered NATO.