This week, Joe Biden lifted one of the many restraints placed on Ukraine in its war with Russia. The outgoing US president has allowed Kyiv to use long-range US-made ATACMS missiles in the Russian region of Kursk, a part of which is currently held by Ukraine. Last night, Kyiv used these missiles to strike a large Russian weapons depot in the Bryansk region neighbouring Kursk, suggesting Ukraine will also be able to use ATACMS on other Russian border regions.