When Vladimir Putin first started targeting the Ukrainian energy sector, it did not have the impact the Kremlin wanted. Ukraine’s ability to withstand the Russian campaign, and carefully ration its power supplies,

A foreign policy expert on CNN strongly condemned recent remarks by President Donald Trump expressing a willingness to invade Venezuela, saying that if the United States did so, "it takes us into the same category as Russia invading Ukraine.

U.S. officials are now in Kyiv for the Trump administration's renewed push to end the Russia-Ukraine war. CBS News chief foreign affairs correspondent and "Face the Nation" moderator Margaret Brennan has the details.

The scene looks almost post-apocalyptic. A convoy of Russian soldiers emerging from thick fog and moving towards the eastern Ukrainian city of Pokrovsk. Some of the troops are riding motorcycles and mopeds;