Late on a recent morning, a woman slowly rode a bicycle beneath the trees long the sun-dappled shores of Sha Tau Kok, a small village on Hong Kong-China border. It was a rare moment of tranquility amid modern China’s bustling urban sprawl. But now this crescent of greenery is at the center of increasingly fraught tensions between the former British Colony and president Xi Jinping’s Communist government in Beijing. Six years ago, mainland authorities occupied a small parcel of land in the village – reportedly for military use – after diverting the course of a river. Carrie Lam, chief executive of Hong Kong, initially said her administration was unaware of any such land occupation. But the apparent cross-border land-grab angered local residents, who have in turn criticized hamstrung city officials for failing to stand up to Beijing. “How could the government not be aware?,” Mr Yau, a local landowner, told local media when the border breach emerged last November. Mr Yau, who did not give his first name, said he feared losing the land his family grew rice on for generations. The Hong Kong government said in a statement that it is looking into the issue and that mainland personnel had…