By Joseph Menn (Reuters) - The U.S. government spent more than a decade preparing responses to malicious hacking by a foreign power but had no clear strategy when Russia launched a disinformation campaign over the internet during the U.S. election campaign, current and former White House cyber security advisers said.

SAN SALVADOR (Reuters) - El Salvador said on Monday that Taiwan's President Tsai Ing-wen will visit the poor Central American country on January 12-13, in a contentious visit that led China to urge U.S. officials to block her from passing through the United States en route.

TOKYO (Reuters) - Japanese Prime Minister Shinzo Abe said on Tuesday he aimed to visit Russia early next year to accelerate talks for resolving a territorial row and concluding a peace treaty officially ending World War Two hostilities.

LIMA (Reuters) - Peruvian President Pedro Pablo Kuczynski and right-wing opposition leader Keiko Fujimori promised on Monday to work together for the good of the country following their first meeting since facing off in a divisive election in June.

By Colin Packham SYDNEY (Reuters) - The United States is ready to confront China should it continue its overreaching maritime claims in the South China Sea, the head of the U.S. Pacific fleet said on Wednesday, comments that threaten to escalate tensions between the two global rivals.

TOKYO (Reuters) - The United States military grounded its tilt-rotor MV-22 Osprey aircraft in Japan on Wednesday after Tokyo called for a halt to flights following a crash southwest of Okinawa island, the first accident involving the aircraft in Japan. A U.S.-operated Osprey crashed into the sea on Tuesday, injuring its crew of five.

BEIJING (Reuters) - China's Taiwan Affairs Office said on Wednesday any interference with or damage to the "one China" principle would have a serious impact on peace and stability in the Taiwan Strait. U.S.

By Kylie MacLellan LONDON (Reuters) - Britain will need a transitional trade agreement with the European Union, and the government should set out plans for it before beginning formal divorce talks with the bloc, members of parliament's upper house said on Tuesday.

SAO PAULO (Reuters) - Brazil's Federal Police asked prosecutors to charge former President Luiz Inacio Lula da Silva for more crimes in the country's widest-ever corruption probe, Globo's G1 news site reported on Monday.

MEXICO CITY (Reuters) - China and Mexico pledged on Monday to deepen ties at a meeting between their top diplomats following last month's U.S. presidential election victory of Donald Trump, who has tested Washington's relationship with both countries.