Reports of a planned "humanitarian intervention" in Ukraine by Russian armed forces have been met with "grave concern" by the Prime Minister and US President, Downing Street says.
Any such move would be "unjustified and illegal" and would prompt "further and tougher sanctions", the two leaders were said to have agreed in a telephone call.
"They reiterated that we continue to urge Russia to engage with the international community and the Ukrainian government to find a political solution to the crisis," a Number 10 readout of this afternoon's call said.
More top news
The model and reality TV star said she had "never been so scared in my life" after finding Shavaughn McKenzie lurking in her driveway.
The Government is to choose which scheme to back after a review of the UK's airport capacity. Here are the three shortlisted options.
The government's long-awaited decision on which scheme - Heathrow or Gatwick - should get the go-ahead will finally be announced later.