It's not by chance that the countries' 4 1/2-year conflict has taken on a naval dimension. Moscow is further imposing on Kiev its annexation of Crimea.
Russia's military already has three of the S-400 "Triumf" divisions on the Black Sea peninsula; it plans to have another in place and operational by the year's end.
The countries are trading blame over a maritime dispute in which Russia fired on Ukrainian vessels, injuring some sailors. The incident has sparked Ukrainian protests and an international backlash.
"Normal people collect stamps and I try to give my cheese to Putin," says cheesemaker David Sirota. "I know 100 ways to get into an event with Putin but every time, his security takes away my cheese."
Many Latvians believe they need to protect themselves against cultural and political assimilation by their giant neighbor. But the country's Russian speakers say the new law is discriminatory.
The winner of the Sakharov Prize is Ukrainian film director turned activist Oleg Sentsov who is serving a lengthy prison sentence in Russia, accused of plotting to bomb sites in Crimea.
The national security adviser said the U.S. will leave the INF Treaty "in due course" — and that President Trump and Russian President Vladimir Putin would like to speak directly again next month.