LONDON (Reuters) -British Prime Minister Liz Truss and U.S. President Joe Biden agreed on Wednesday that Russian President Vladimir Putin’s actions highlight the need for allies to continue their economic and military support to Ukraine, Truss’s office said. Putin ordered Russia’s first wartime mobilisation since World War Two on Wednesday during a televised address in which he also announced moves to annex swaths of Ukrainian territory and threatened to use nuclear weapons to defend Russia. “The leaders condemned Putin’s recent belligerent statements on Ukraine,” a spokesperson for Truss, who…