Gold, crude oil and grains surged on Monday while industrial metals slid as investors reacted to escalating tensions between Moscow and Kiev after the Russian military tightened its grip on Ukraine's Crimea region. Concern about supplies pushed up crude oil prices by more than $2 a barrel and wheat and corn by 4-6 percent. Safe-haven buying sent gold prices to four-month highs. Base metals such as copper fell along with shares as investors ditched higher-risk assets and due to worries that a conflict could damage global growth. "Trade sanctions and a general ratcheting up of global tensions could also endanger the fragile global economic recovery now under way, hurting commodity prices in the process," analyst Edward Meir at broker INTL FCStone said.