Beginning in the mid-1990s, Akayev took several steps to increase presidential power vis-à-vis the legislative branch, including questionable referenda and suppression of opposition groups. Before the 2000 presidential election, Feliks Kulov, Akayev’s chief rival for the presidency, was imprisoned. In 2001 Kyrgyzstan offered the United States an air base at Manas Airport in support of Operation Enduring Freedom in Afghanistan, reinforcing relations with the United States but increasing tension with Russia. The arrest of dissident parliamentary deputy Azimbek Beknazarov in 2002 caused large-scale protests. The harsh suppression of those protests brought about the resignation of the government. In 2003 a referendum, criticized by international monitors, approved Akayev serving his full presidential term (through 2005) in the face of strong demands for his resignation. That same year, the parliament approved lifelong immunity from prosecution for Akayev and his family. In February 2005, international monitors declared the first round of national parliamentary elections to have been unfair. In March the protests that arose in response forced Akayev to flee into exile. Akayev resigned the presidency in April. In a compromise division of power, an interim government was formed with opposition leader Kurmanbek Bakiyev as prime minister (hence, in the absence of a president, also acting president), but the already elected parliament took office as scheduled. In a special election, Bakiyev was elected president in July 2005, running on the same ticket as his main political rival, Feliks Kulov. Bakiyev then named Kulov prime minister to achieve unity.