May 16, 2009 — Yukio Hatoyama succeeds DPJ presidency from Ichiro Ozawa, who resigned after an aide’s indictment over illicit funds involving a construction firm.
July 19 — Hatoyama says in Okinawa he seeks to move the Futenma base outside the prefecture.
Aug. 30 — DPJ wins Lower House poll, taking 308 of 480 seats.
Sept. 16 — Hatoyama launches coalition government with Social Democratic Party and Kokumin Shinto (People’s New Party).
Nov. 13 — Hatoyama asks U.S. President Barack Obama to trust him on Futenma at a summit in Tokyo.
Dec. 24 — Ex-aides to Hatoyama indicted over political funds management body’s false reporting of donations.
Dec. 25 — Hatoyama vows to resolve Futenma by the end of May.
Feb. 4, 2010 — DPJ lawmaker Tomohiro Ishikawa, two other Ozawa aides indicted. Ozawa avoids charges.
April 25 — About 90,000 people rally in Okinawa, calling for Futenma to be moved outside prefecture.
May 4 — Hatoyama visits Okinawa for first time as prime minister.
May 23 — Hatoyama visits Okinawa again, tells Gov. Hirokazu Nakaima of plan to move Futenma to already planned area within Okinawa, offers apology.
May 28 — Japan, U.S. reach fresh accord on Futenma’s relocation. SDP chief Mizuho Fukushima dismissed as minister for refusing to endorse the relocation.
May 30 — SDP decides to leave coalition government.
June 2 — Hatoyama announces resignation. Ozawa, all other DPJ executives decide to resign from party posts en masse.