A government spokesman said:
Since the crisis in Ukraine began, all Nato Allies have contributed to the Alliance's response. As this report recognises, a direct attack by Russia on a Nato state is unlikely, but Russian aggression against Ukraine cannot be ignored.
So the UK is demonstrating our clear commitment to Allies and partners in eastern Europe. We have deployed UK Typhoon aircraft to the Baltic states and over 1,300 UK personnel will participate in a range of major military exercises across eastern Europe.
In addition to this, the further package of economic sanctions against Russia announced this week, across defence, finance and high-tech energy goods, continues to show that there are costs for its actions to destabilise Ukraine.
In the run up to the Nato summit in Wales, the UK are negotiating across the Alliance to ensure Nato can continue to be at the forefront of building stability in a unpredictable world.
More top news
At least four people have been killed after gunmen opened fire at government offices in the Mexican beach resort of Cancun.
The mobile phone provider was fined by Ofcom after overcharging around 40,000 customers nearly £250,000 over calling "150."
Colo became a mother of three, grandmother of 16, great-grandmother of 12 and great-great-grandmother of three.