North Korea fired six short-range projectiles into the sea Thursday in a show of defiance just hours after the United Nations adopted the toughest sanctions to date on Pyongyang over its fourth nuclear test and rocket launch.

North Korea fired six short-range projectiles into the sea Thursday in a show of defiance just hours after the United Nations adopted the toughest sanctions to date on Pyongyang over its fourth nuclear test and rocket launch.

Limited displays of military firepower have become a routine response by North Korea to international pressure over anything from its nuclear weapons program to its human rights record.

South Korea's defense ministry said the six projectiles - either rockets or guided missiles - fell into the sea around 100-150 kilometers (60-90 miles) off the North's eastern coast.

The launches came after the UN Security Council unanimously passed a resolution late Wednesday imposing new sanctions after seven weeks of arduous negotiations between the United States and China, Pyongyang's sole major ally.

The sanctions break new ground, requiring all countries to inspect cargo destined for and coming from North Korea, in all airports and sea ports.

They also ban or restrict exports of coal, iron and iron ore and other minerals from North Korea, and prohibit the supply of aviation fuel including rocket fuel.