The Prime Minister spoke to Anders Fogh Rasmussen on the 65th anniversary of the signing of the North Atlantic Treaty.
Following the phone call, a Downing Street spokesperson said:
Earlier this afternoon, the Prime Minister David Cameron spoke to the NATO Secretary General Anders Fogh Rasmussen regarding the ongoing events in Ukraine and looking forward to the NATO summit in Wales this September.
The PM began the call by congratulating the Secretary General on the 65th anniversary of NATO, emphasising that the alliance was more relevant and important than ever in light of events in the Ukraine. The Secretary General thanked the UK for its ongoing support in reassuring NATO allies on the border of Russia and Ukraine.
They agreed that the summit would be an ideal opportunity to demonstrate NATO remains capable, strong and confident, continuing to protect us and other NATO allies far into the future.