Because I am a Canadian and Ukraine is our ally. It matters to me and my countrymen that our allies contribute to war efforts and humanitarian aid in a timely and lawful manner.
And I am half Ukrainian. Crimea to be precise. Despite decades and centuries of oppression and violence, the Cossacks (Khazak - loosely meaning "free men, adventurers having the right to travel and associate" and albeit peculiar, it was the only democracy in the region.
Ukraine had been meddled by Poland, Sweden ( yeah, Sweden) and Russia, annexed by Austria and occupied by Russia. In WW1, my grandfather had the option fighting for the axis or death by firing squad. He was captured by the allies and released soon thereafter, because he inherently supported democracy. He sneaked back into Ukraine, rounded up the woman he loved and her daughter (who was not his blood) and escaped to the west.
That girl was my grandmother. We lost people then and we are missing people now.
But why do you care?