The Soviet Union, realising that military success by insurgents in Angola and Mozambique was becoming increasingly remote, shifted much of its military support to the PAIGC in Guinea, while increasing diplomatic efforts to isolate Portugal from the world community. The success of the socialist bloc in isolating Portugal diplomatically extended inside Portugal itself into the armed forces, where younger officers disenchanted with the Estado Novo regime and promotional opportunities began to identify ideologically with those calling for overthrow of the government and the establishment of a state based on Marxist principles.