LONDON (Reuters) -Britain is not going to be looking at how to help Russia, a senior minister said on Tuesday when asked about the prospect of swapping pro-Russian politician Viktor Medvedchuk for two British fighters who were captured in Ukraine by Russian forces. The Britons appeared on Russian state TV on Monday and asked to be exchanged for Medvedchuk, a Ukrainian ally of Russian President Vladimir Putin who is being held by the Ukrainian authorities. Asked on Sky News whether a possible swap was something the government would get involved with, Britain’s Northern Ireland minister Brandon …