Embassy staff, currently in Poland, organize transportation for dozens of citizens and relatives to flee Ukraine as Russian forces encircle major cities

Michael Shudrich says dozens have been helped by ad hoc crisis group, as community prepares for many more displaced people fleeing Russian invasion

Civilians pour into Poland and other neighboring countries; UN refugee agency expects up to 4 million Ukrainians could flee if situation deteriorates further

As Putin begins invasion with assault on Ukrainian cities, he warns world to not interfere; US, NATO vow response, expected to come in form of sanctions

Kyiv's allies vow support as fears grow over massive Russian military buildup on border and an uptick in clashes with separatists