Russia has protested to Germany's new ambassador over comments by the German finance minister. Wolfgang Schäuble likened the Russian takeover of Crimea to the Nazi annexation of the Sudetenland in 1938.
Ukraine's president has accused Russian forces of sending troops into Ukraine. The country's security and defense council said Russian troops have seized control of a key southeastern border town.
The Ukraine crisis has led to a rift between the West and Russia, with both sides imposing sanctions against each other. However, Russia's gas exports have so far remained untouched - for a number of reasons.
Pro-Russian rebels negotiating with mediators in Belarus have said they were willing to forego full independence from Ukraine in exchange for autonomy. The talks are scheduled to resume later in the week.
Ukrainian forces have withdrawn from the Luhansk airport and a nearby village after coming under artillery fire. Fresh talks between Russian and Ukranian representatives are underway in Minsk.
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