Russia is freezing a contract to deliver S-300 air defense missiles to Iran after the adoption of the new UN sanctions against Tehran, a Russian source told the Interfax news agency on Thursday.

"It is compulsory to fulfill a decision by the U.N. Security Council and Russia is not an exception here," said the source in the Federal Service for Military Technical Cooperation, which supervises Russian arms sales.

North Korea's military said Thursday it is scrapping a pact aimed at preventing accidental armed clashes with South Korea, as tensions rose sharply over the sinking of a warship.

The general chiefs of staff, in a notice to the South's armed forces, also warned of an immediate attack if the South violates the disputed Yellow Sea border, Pyongyang's official news agency reported.

At least 44 civilians have been killed in an assault by Jamaica's security forces on a slum to capture an alleged drug kingpin, a senior official said Wednesday.

The government had ordered a political ombudsman and a public defender to visit the area of western Kingston to assess casualties and damage after accusations by residents of civilian deaths.

The pilots of a jet which crashed in Russia killing Polish president Lech Kaczynski and 95 others repeatedly ignored automatic alerts they were flying too low, a Polish investigator said Wednesday.

Investigator Edmund Klich told Poland's Rzeczpospolita daily that the crew "failed to react to automatic signals: the warning 'terrain ahead' or 'pull up'. These were ignored."

Russian Foreign Minister Sergei Lavrov on Thursday doubted Iran would fulfill the terms of a deal brokered by Brazil and Turkey aimed at resolving the Iranian nuclear crisis.

"There are no 100 percent guarantees. Very much will depend on how Iran will approach its commitments. If it strictly abides by them, Russia will actively support the scheme proposed by Brazil and Turkey," Lavrov said.