NATO has called on Russia to stop the "illegal" annexation of Crimea.

“We call on Russia to end its illegal and self-declared annexation of Crimea. We call on Russia to pull back its troops from Ukraine and stop the flow of arms to separatists”- NATO Secretary General Anders Rasmussen said during NATO-Ukraine commission in Wales on Thursday.
Rasmussen said the gathering of the leaders should telegraph a "clear message" to Ukraine that NATO stands with the nation and supports its reforms.

He said leaders would work with Ukraine to modernize its army and improve the ability of Ukrainian and NATO forces to work together.
“The partnership between NATO and Ukraine is strong and we are determined to make it even stronger today and in the future,” he said.