Relations between the United States and Cuba deteriorated rapidly as the Cuban government, in reaction to the refusal of Royal Dutch Shell, Standard Oil and Texaco to refine petroleum from the Soviet Union in Cuban refineries under their control, took control of those refineries in July 1960. The Eisenhower administration promoted a boycott of Cuba by oil companies, to which Cuba responded by nationalizing the refineries in August 1960. Both sides continued to escalate the dispute. Cuba expropriated more US-owned properties, notably those belonging to the International Telephone and Telegraph Company (ITT) and to the United Fruit Company. In the Castro government's first agrarian reform law, on 17 May 1959, the state sought to limit the size of land holdings, and to distribute that land to small farmers in "Vital Minimum" tracts. This law served as a pretext for seizing lands held by foreigners and for redistributing them to Cuban citizens.