President Zelensky has been pushing for this moment for months. When it finally came, he was a little coy.
Strikes are not made with words, he said in his nightly address: "Such things are not announced, missiles speak for themselves".
President Biden has given Ukraine permission to use long range missiles supplied by Washington to strike deep inside Russia.
It is thought that initially Ukraine’s use of the Army Tactical Missile System – known by its acronym ATACMS – will be confined to defending Ukrainian troops still holding on to a small chunk of Russian territory in the Kursk region.