Ukraine army to respond if Russia tries to annex east

Ukraine will respond with military action if Russia attempts to annex the country's mainly Russian-speaking eastern regions, interim prime minister Arseniy Yatsenyuk said on Thursday.

"I want to officially warn Russia: we will respond firmly, including through military means, against any attempt to seize Ukraine, to cross borders, or annex eastern or other regions by Russian troops," Yatsenyuk was quoted as saying in Brussels on the government website.