North Korea’s official oil imports slowed considerably between April and June, newly released U.N. data shows, as the country clamped down on foreign trade to quash the spread of COVID-19 within its borders.

But the official figures appear to clash with available satellite imagery showing likely oil deliveries, in a sign the country continued clandestine imports of the U.N.-sanctioned commodity.

According to figures that Beijing submitted to the U.N., China exported no refined oil to North Korea in May and just 3,460 barrels in June. On paper, the latest imports mean