The comments raise the prospect of a return to a Cold War-type arms race with Russia over the use of nuclear missiles
The Foreign Secretary said there were “worrying signs” about the increased activity of Russian forces and the UK would consider the pros and cons of taking US intermediate-range weapons.
Mr Hammond said there was “no clear sign” of an imminent attack on Ukraine but Vladimir Putin is “keeping his options open”.
But he warned against making “unnecessary provocations” against Russia, which has a “sense of being surrounded and under attack”.
“We have got to send a clear signal to Russia that we will not allow them to transgress our red lines.”