By Ethan Lou CALGARY, Alberta (Reuters) - Canada's main spy agency last year warned energy companies about an increasing risk of cyber espionage and attacks on pipelines, oil storage and shipment facilities and power transmission towers using homemade explosives, according to a classified document seen by Reuters.

By Adriana Barrera MEXICO CITY (Reuters) - The United States, Mexico and Cuba aim to sign an agreement determining territorial water limits before U.S. President-elect Donald Trump takes office on Jan. 20, three diplomatic officials familiar with the matter said on Tuesday. The accord will cover the Eastern Gap of the Gulf of Mexico, an area believed to be rich in oil and gas deposits.

WASHINGTON (Reuters) - The United States imposed sanctions on Bosnian Serb nationalist leader Milorad Dodik on Tuesday for actively obstructing efforts to implement the 1995 Dayton Accords that ended the more than three-year war in Bosnia and Herzegovina. Dodik is the president of Republika Srpska, the autonomous Bosnian Serb half of the country established by the agreements.

BEIJING (Reuters) - China is willing to play a constructive role in seeking a political resolution to the crisis over Ukraine, Chinese President Xi Jinping told his Ukrainian counterpart, adding that he considers the eastern European country a friend.

BEIJING (Reuters) - The world needs China and the United States to have a stable and cooperative relationship, Chinese President Xi Jinping told U.S. Vice President Joe Biden, just days before new uncertainty looms with Donald Trump taking office as president.

BEIJING (Reuters) - An official in northern China has been fired after he called the founder of modern China Mao Zedong a "devil" on social media and called the annual commemoration of Mao's birthday "the world's largest cult activity".

CARACAS (Reuters) - Venezuela's socialist leader said on Monday that U.S. President-elect Donald Trump was the victim of a global "hate campaign" and could not be worse than outgoing Barack Obama.

By Tom Perry and Suleiman Al-Khalidi BEIRUT/AMMAN (Reuters) - Syrian rebel groups have decided to attend peace talks backed by Russia and Turkey in Kazakhstan to press for full implementation of a ceasefire they say has been widely violated by the government and its Iranian-backed allies.

SEOUL (Reuters) - More high-level North Korean diplomats are waiting to defect to South Korea from their overseas posts in Europe, Pyongyang's former deputy ambassador to London said on Tuesday, according to the Yonhap News Agency.

By Kylie MacLellan LONDON (Reuters) - Britain will not seek a Brexit deal that leaves it "half in, half out" of the European Union, Prime Minister Theresa May will say on Tuesday, according to her office, in a speech setting out her 12 priorities for upcoming divorce talks with the bloc.