On a quiet midweek evening on the streets of the Cambodian capital, the Pyongyang Restaurant is at near capacity. Inside the square room, adorned with dramatic landscape murals, music starts to blast. Waitresses in bright traditional Korean garb drop their trays and pick up their instruments. With great skill they twirl in formation and belt out odes to the homeland. It is patriotic, unapologetic North Korea thousands of miles from the secretive state.

North Korean tour guides lead visitors through the regime’s latest cultural showpiece, a grand new panorama museum reported to have cost $24m. [...] Part grand design and part diplomacy project, the Angkor Panorama museum, which opened in December, is the latest cultural export North Korea hopes will bring in much-needed funds for its struggling economy.