The UK has confirmed it is sending 75 military personnel to Ukraine to provide advice and training.
Defence Secretary Michael Fallon says London is also considering 'further requests' from Kiev for additional support.
But he insists Britain will not send combat troops to the region.
Pro-Russian rebels say they have been pulling back heavy weapons from the front lines in eastern Ukraine, but the government in Kiev has questioned these claims.
UK Prime Minister David Cameron says he will push for more sanctions on Moscow if separatists in Ukraine fail to observe a ceasefire.
Michael Fallon told MPs there would be no mission creep.
IN: "Let me...
OUT: ...suffering."
DUR: 21 seconds
ALT:
Michael Fallon told MPs the pressure would be maintained on Russia.
IN: "We have...
OUT: ...they need."
DUR: 30 seconds