Russia extends troop drills; Ukraine appeals for ceasefire

Russia extended military drills near Ukraine's northern borders Sunday amid increased fears that two days of sustained shelling along the contact line between soldiers and Russa-backed separatists in eastern Ukraine could spark an invasion. Ukraine's president appealed for a ceasefire.

The exercises were originally set to end Sunday and brought a sizable contingent of Russian forces to Belarus. The presence of the Russian troops raised concern that they could be used to sweep down on the Ukrainian capital, Kyiv, a city of about 3 million people less than a three-hour drive away.

Western leaders warned that Russia was poised to attack its neighbour, which is surrounded on three sides by about 150,000 Russian soldiers, warplanes and equipment. Russia held nuclear drills Saturday as well as the conventional exercises in Belarus, and has ongoing naval drills off the coast in the Black Sea.

The United States and many European countries have alleged for months that Russia is trying to create pretexts to invade. They have threatened massive, immediate sanctions if it does.

" We're talking about the potential for war in Europe," U.S. Vice President Kamala Harris said Sunday at a security conference in Munich, Germany. "It's been over 70 years, and through those 70 years ... there has been peace and security."