Main news of December 20

WORLD

* Ukrainian Prime Minister Yulia Tymoshenko said that President Viktor Yushchenko must resign on Saturday as he is weakening the country's economy on purpose

* U.S. President-elect Barack Obama plans to resume talks on strategic arms reductions with Russia but negotiations will be difficult as two countries do not trust each other, a U.S. congresswoman said

* An Ariane 5 carrier rocket with two telecoms satellites will be launched from the Kourou space center in French Guiana on early December 21, the European space concern Arianspace SA said

RUSSIA

* At least nine people were injured after an unknown explosive device went off at a market in the south of Moscow near the Prazhskaya metro station, a police source said

* Russian aluminum giant RusAl said in a statement that two of its employees have been abducted in southern Nigeria after unknown suspects attacked a community of Russian workers