Ukraine crisis: How will the UK help Ukraine battle Russia if Vladimir Putin launches a full-scale invasion?

"Where it gets difficult and begins to move into the grey area between being involved directly or not is when you start talking about special forces or operations within Ukraine - that's a line I think the government would be pretty reluctant to cross but will be on the agenda," he said. Prof Chalmers said he did not think the UK would send over large equipment as Russia's superior force would destroy it quickly and Ukrainian forces would need training on how to use and maintain it.