US Vice President Joe Biden has said Russia cannot be allowed to redraw the map of Europe.
Speaking at the European Council in Brussels, Biden said Ukraine "is fighting for their very survival right now."
"President Putin continues to call for new peace plans as his troops roll through the Ukrainian countryside and he absolutely ignores every agreement that his country has signed in the past and he has signed recently - including in Minsk," the Vice President said.
This is the moment where the United States and Europe must stand together, stand firm. Russia cannot be allowed to redraw the map of Europe, because that is exactly what they are doing".
US Vice President Joe Biden will discuss the situation in Ukraine with European leaders in Brussels on Friday, including the possibility of imposing "additional costs" on Russia.
Vice President Biden will also discuss options for helping Ukraine in its armed conflict with rebels, including security and financial aid.
He is due to meet German Chancellor Angela Merkel and Ukrainian President Petro Poroshenko at a security conference in Munich.
Gun shots were fired from a passing vehicle near the home of US Vice President Joe Biden's house, the Secret Service has told CNN.
Mr Biden and his wife, Dr Jill Biden, were not at the home in Greenville, Delaware, at the time.
Secret Service spokesperson Robert Hoback said: "A vehicle drove by the vice-president's residence at a high rate of speed and fired multiple gun shots."
Mr Hoback said the shots were heard by Secret Service officials at Mr Biden's home at around 8.25pm local time last night and were being investigated.
He said they were fired on the public road, beyond the residence's security perimeter and a few hundred yards from the building.
Joe Biden has joined in with the selfie craze with none other than Barack Obama.
The US Vice President posted the photograph - taken in the back of the presidential limousine- on Instagram with the message: "Found a friend to join my first selfie on Instagram, Thanks for following and stay tuned. VP."
US Vice President Joe Biden will travel to Kiev in a show of support for Ukraine's new government, the White House announced.
Pro-Russian gunmen took control of a city in eastern Ukraine today as Kiev prepared troops to tackle what it called an "act of aggression by Russia", pushing the conflict between the neighbours into a dangerous new phase.
Mr Biden will travel to Ukraine on April 22 to meet with government officials and civil society groups ahead of the Ukrainian presidential election in May.
US president Barack Obama and vice-president Joe Biden have joined forces in an exercise video encouraging Americans to get fit.Read the full story ›
US Vice President Joe Biden has spoken to Ukrainian President Viktor Yanukovich today by phone, the White House announced.
This is the latest in a series of calls between the two men since clashes between anti-government protesters and riot police erupted in the capital Kiev.
Former British Prime Minister Tony Blair and US vice president Joe Biden have paid homage to Ariel Sharon at his state funeral service in Jerusalem.
US Vice President Joe Biden said there was "no doubt" the Syrian government was responsible for a suspected chemical weapons attack and that it must be held accountable for the "heinous" action.
Mr Biden said in a speech, "There is no doubt who is responsible for this heinous use of chemical weapons in Syria: the Syrian regime."
"Those who use chemical weapons against defenceless men, women and children should and must be held accountable," he added.
The White House said earlier that President Barack Obama had not yet decided how the US would respond to the attack, which occurred in a suburb of Damascus.
US Vice-President Joe Biden has launched his new podcast, "Being Biden," to offer an insight into his life as America's number two.
Biden is expected to share his views in his usual candid way. According to the White House, in each instalment he will also tell the story behind a particular photo.