July 1964: Three tons of weapons shipped by Cuba is discovered in Venezuela. OAS adopts economic and diplomatic sanctions on Cuba. Most OAS members break relations with Cuba. Mexico refuses to abide by sanctions.
Oct. 10-Nov. 15, 1965: Cuban government allows exiles to sail to the port of Camarioca to pick up relatives on the island. About 5,000 Cubans reach Florida in a wildly disorganized flow. (16)
December 1965 -- In response, President Johnson establishes U.S.-operated ''Freedom Flights'' from Varadero to Miami. A total of 260,561 Cubans reach the United States on the flights by the time the program ends in April 1973. (17)
1965: Argentine-born revolution hero Ernesto ''Che'' Guevara leads 120 Cubans on six-month mission to fight alongside rebels in then-Belgian Congo.
January 1966: More than 500 delegates arrive in Havana for the Tri-Continental Conference, a meeting of revolutionaries from Africa, Asia and Latin America.
Oct. 8, 1967 -- Che Guevara is captured and executed in Bolivia while leading a Cuban-sponsored guerrilla movement. (18)
January 1968: Cuban government announces the arrest of a pro-Soviet ''microfaction'' of 43 officials accused of betraying the revolution. Their alleged leader, Anibal Escalante, head of the old Popular Socialist Party (communist), serves part of a 15-year prison term, later dies as a farm administrator.
July 1969: Seven-ship Soviet naval squadron -- including a rocket-launcher vessel -- arrives in Cuba, signaling renewal of Soviet expansionism in the Caribbean.
December 1969: More than 200 Americans -- the first of a series of Venceremos Brigades that arrive annually for at least 20 years -- reach Cuba via Mexico to help harvest sugar cane. (19)
1970s -- Small Cuban unit trains Palestinian guerrillas in Algeria.
1970s-80s: Cuba finances and trains Los Macheteros, Puerto Rican pro-independence radicals who bombed several mainland U.S. civilian targets, killing four and wounding more than 50, and robbed $7 million from a Wells Fargo truck in Connecticut in 1983.
April 1970: The number of exiles registered at the Cuban Refugee Center reaches 364,000; Cubans now represent about 23 percent of the population of Dade County.
July 26, 1970: Castro accepts responsibility for failure of an all-out effort to harvest 10 million tons of sugar cane. When he offers to resign, the crowd roars its rejection.
Sept. 25, 1970: Nixon administration warns Moscow to halt construction of a base for nuclear submarines at Cienfuegos, on Cuba's southern coast. The Soviets withdraw, temporarily.
1970 -- Castro ships weapons to Chile's Movement of the Revolutionary Left.
May 1971: Government establishes harsh restrictions on education and culture. Castro condemns any artistic or literary work that is contrary to the revolution.
July 1972: Cuba joins Comecon, the Soviet bloc's economic alliance.
July 1972: Businessman Manolo Reboso is appointed to the Miami City Commission, becoming the first Cuban exile to hold the position.
April 1973: ''Freedom Flights'' are halted by Cuba after bringing 260,561 people to Miami.
October 1973: Havana sends 500 tank drivers to fight for Syria in the Yom Kippur War against Israel.
Jan. 28, 1974: Soviet leader Leonid Brezhnev visits Havana. Agreement signed for Soviet technical assistance in petroleum exploration, agriculture and medicine.(20)
April 1974: Miami exile leader Jose Elias de la Torriente, criticized for failing to invade Cuba after collecting large sums of money for the operation, is shot to death by an unknown assailant. The killing sparks a period of political violence in Miami.