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Hungary has blocked a multi-billion-dollar package of EU aid for Ukraine, just hours after an agreement was reached on starting formal talks on Kyiv's application to join the bloc.

Boris Nadezhdin has promised to take on Vladimir Putin in the presidential election to be held next March in Russia.

And Serbia鈥檚 opposition parties unite to challenge President Aleksandar Vu膷i膰鈥檚 decade-long grip on power in a snap general election on December 17.