By Toby Sterling and William James LONDON/THE HAGUE (Reuters) -Britain will send investigators to Ukraine to help gather evidence of war crimes, including sexual violence, its foreign minister said on Friday. Both Ukrainian prosecutors and the International Criminal Court (ICC) are investigating potential war crimes in Ukraine since Russia’s Feb. 24 invasion, which the Kremlin calls a “special military operation” to demilitarise its neighbour. Moscow denies committing war crimes in Ukraine or targeting civilians during a war that has killed thousands, devastated many cities and towns and force…