NATO will restrict Belarus’ access to their headquarters, following the forced landing of a passenger plane in the nation’s capital, Secretary-General Jens Stoltenberg confirmed on Monday.

Belarus is not a member of NATO but has had ties with the military alliance since 1992, after the collapse of the Soviet Union. It has maintained a diplomatic mission to NATO for over 20 years.

But diplomats can still attend meetings at NATO and in NATO countries as part of a cooperation partnership that tackles arms control and military education.

The restricted access comes after a Ryanair flight from Greece to Lithuania was diverted to Belarus to arrest a dissident journalist last month.