In 2004, the EU gained 10 new members. (Estonia, Latvia, and Lithuania, which had been part of the Soviet Union; Czech Republic, Hungary, Poland, Slovakia, and Slovenia, five former-communist countries; Malta, and the divided island of Cyprus.) These were followed by Bulgaria and Romania in 2007. Russia's regime had interpreted these expansions as violations against NATO's promise to not expand "one inch to the east" in 1990. Russia engaged in a number of bilateral disputes about gas supplies with Belarus and Ukraine which endangered gas supplies to Europe. Russia also engaged in a minor war with Georgia in 2008.