We brought together the main events of the crisis in Ukraine in recent months.
In November, for the first time, there was widespread news about how Russian troops seemed to be gathering at the Ukrainian border.
Since then, the number of Russian troops at the border has risen to more than 150,000, according to intelligence.
Western leaders have in turn discussed the Russian president Vladimir Putin but the results seem to be stuck in photographs and forced briefings.
On Tuesday night, the EU decided on new sanctions against Russia.
See here how Russia has tightened tensions in Ukraine from the end of last year to the present day.