(Reuters) – A senior official said on Monday Russia had enough buckwheat and sugar to fulfil domestic demand and warned consumers against panic-buying staple items after the West hit Russia with sweeping sanctions over its military campaign in Ukraine. The Kremlin says the sanctions amount to a declaration of economic war by the United States and its allies. Speaking at a televised meeting chaired by Prime Minister Mikhail Mishustin, Deputy Prime Minister Viktoria Abramchenko warned Russians against stockpiling staples such as buckwheat and sugar as they did at the start of the pandemic in 202…