Britain's top share index fell to a two-week low on Monday, set for its biggest fall in over eight months as investors' appetite for riskier assets fell due to the increasingly tense situation in Ukraine, Reuters reported. Banks, insurers, mining and energy stocks were among the big fallers after Ukraine mobilised for war following Russian President Vladimir Putin's declaration that he had the right to invade his neighbour. The FTSE 100 was down by 132.80 points, or 2 percent, at 6,676.90 by 1142 GMT, set for its biggest daily fall since last June. Only five stocks were in positive territory, with precious metal miners Randgold and Fresnillo the top risers, benefiting from a flight to safety that boosted the gold price. Companies with direct exposure to Russia were the hardest hit. Oil major BP, which has a significant stake in Russia's biggest oil producer Rosneft, fell more than 2 percent, alone trimming 8 points off the index, on concerns of an escalation in tensions. Rosneft shares slumped more than 8 percent. Gold miners aside, miners suffered. The UK mining index fell 2 percent, hurt by geopolitical concerns and weakness in copper, which slipped on data showing a further drop in factory activity in China, the world's top metals consumer.