Main news of September 22

A roundup of what has happened in the past 24 hours

WORLD

* Polish experts working in Moscow on a probe into the plane crash that killed the Polish president and 95 others near Smolensk in April are "dissatisfied" with the documents supplied by the Russia side, Poland's TVN24 channel said

*  The Warsaw District Prosecutor's Office has received and is studying Russia's extradition request for Chechen leader-in-exile Akhmed Zakayev, a spokesperson said

* World's leading experts on the Arctic and prominent politicians will gather on Wednesday in the Russian capital to discuss the political, economic and environmental issues affecting the Arctic region

RUSSIA

* Atlant-Soyuz, an airline controlled by the Moscow city government, is considering the possibility of buying about 30 Sukhoi Superjet 100 passenger jets, a company source said

* The lower house of the Russian parliament adopted amendments to the Official Secrets Act enlarging the list of information that constitutes a state secret

* Moscow joined other global cities in declaring Wednesday a car-free day but the streets of the Russian capital were still overwhelmed with cars during morning rush hour

* Russia's gas giant Gazprom and China's oil and gas corporation CNPC have agreed key elements of a deal for Russian gas supplies to China, Gazprom said

* The upper house of the Russian parliament (Federation Council) will draw up a bill on the creation of forest aviation units in the country in a bid to prevent a repetition of this summer's wild fire crisis, the Federation Council's speaker said

* A Russian child who was adopted in the U.S. and then sent back to Russia does not want to be adopted again and remains at a children's center in Moscow, the Russian children's ombudsman said

DEFENSE

* Russian President Dmitry Medvedev has signed a decree banning the delivery of S-300 air defense systems and a host of other major arms to Iran, the Kremlin said

* Russia is working on a military laser system, the chief of Russia's Armed Forces General Staff said

SCIENCE

* Satellite manufacturer Thales Alenia Space signed a three-party agreement with two Russian space enterprises to supply electronic components for three communications satellites, the company said