The United States received proper Russian notification ahead of its Intercontinental Ballistic Missile test-fire in line with a nuclear arms treaty between the two countries, a US official has said.
Russia notified the US of its plans before the crisis in the Crimea region began, the official, who wanted to remain anonymous, added.
Ukrainian and Russian troops were involved in a tense stand-off today after Ukrainian soldiers approached during a tense stand-off at a seized Belbeck air base in the Crimea region.
Russian president Vladimir Putin said he would only use force in Ukraine as a "last resort" as he defended Russia's actions in Crimea.
If you wonder what the attitude of world leaders to the crisis in Ukraine is, you are not alone - I don't think they know either.
There are fears of gas shortages in Ukraine after Russia announced it would raise its prices. But will that affect the rest of Europe?