Many successful lawsuits have resulted from discriminatory or retaliatory termination. All of these actions provoked retaliatory killings in Belfast. President Correa has intimidated journalists and subjected them to "public denunciation and retaliatory litigation". He was responsible for the Industrial Relations Act that caused immediate retaliatory union strikes. The retributive approach tends to be retaliatory and vengeance-oriented. Russian ballistic missile submarines were put on alert in preparation for a possible retaliatory strike. Local defenses must be reinforced by the further deterrent of massive retaliatory power. Sikhs and Muslims were both victims and perpetrators of retaliatory violence against each other. Yeltsin had to decide whether to launch a retaliatory nuclear strike against the United States. Gandhi ordered the Indian Army to launch massive retaliatory strikes in response. However, Dayan sanctioned a number of more limited retaliatory actions. Over-exploitation of local fish stocks and retaliatory killing are also significant threats. The tariffs angered trading partners, who implemented retaliatory tariffs on U.S. goods. Violence often leads to retaliatory and vigilante violence within the slum. This included a river fleet which it used for retaliatory attacks on uncooperative villages.