NATO will hold a long-planned major nuclear exercise next week, the alliance’s chief said Thursday, a few weeks after President Vladimir Putin announced changes to Russia’s nuclear doctrine to discourage Ukraine’s Western allies from supporting attacks on his country.

The “Steadfast Noon” exercise starts on Monday and will run for about two weeks. It will be led by Belgium and the Netherlands, use eight military bases and involve 2,000 personnel and 60 aircraft from 13 nations. The exercise has been held at roughly the same time each year for over a decade.