Ukraine is the largest country in Europe. It has a population of around 43,000,000.
Ukraine is split roughly between pro-Russian sentiment in the east and those favoring closer ties to the EU in the west.
US Vice President Joe Biden has visited Ukraine in one last show of support. Though Biden urged the incoming government to support Ukraine, Donald Trump looks set cut a deal with Moscow over Kyiv's head.
The OSCE has reported nearly 3,000 explosions near the contact line, marking a notable increase in ceasefire violations. A new investigative report revealed Russian artillery attacks in 2014, undermining Moscow's claims.
The hack into a Ukraine military app has reinforced claims the cyber unit known as "Fancy Bear" has a direct Kremlin link. It also reinforces US intelligence reports linking the Kremlin to cyber attacks in the US.
Precious archaeological treasures loaned to an Amsterdam museum are at the center of a legal dispute between Ukraine and Russia. Judges ruled they should be returned to Ukraine - but stay hidden for the next few months.