A war of words between Ukraine and Russia, as Moscow says there is no proof it sent troops, arms to east Ukraine. Deborah Lutterbeck reports.
This is what is left of someone's home in eastern Ukraine. Part of the battlefield in the fight for control of the east of the country. This woman was asleep when her home was hit by a shell. Against this backdrop of war, Ukrainian President Petro Poroshenko at Davos for the World Economic Forum meeting is cutting short his trip as he calls for a return to a ceasefire agreed to last September. (SOUNDBITE) (English) UKRAINE PRESIDENT PETRO POROSHENKO SAYING: "This is ceasefire, close the border, withdrawing all the foreign troops from the territory of my country, withdrawing all the heavy artillery from the touchline, and have a launch in the political process. The far we are from the my peace plan, the more danger for the additional, very dangerous escalation of the situation." The ceasefire has has never fully taken hold -- leaving in its wake broken homes and bitter memories. Poroshenko is pointing the finger at Moscow accusing Russia is sending thousands of troops into the region. Not so says Russian Foreign Minister Sergei Lavrov. (SOUNDBITE) (Russian) RUSSIAN FOREIGN MINISTER, SERGEI LAVROV, SAYING: "Concerning the flow of troops and weapons, we have heard of it many times. I always say that if you are saying it with such certainty, then show us the facts. No one is able to provide us with the facts or does not want to provide them, I do not know." Some 4,800 people have died in the conflict in Ukraine. The leaders of Germany and France have refused to meet Russia's President Vladimir Putin to discuss the crisis until Moscow ensures progress on the truce.