Eastern Ukraine
According to a 2016 survey of religion in Ukraine held by the Razumkov Center, 73.5% of the population in Eastern Ukraine were Christians (63.2% Eastern Orthodox, 8.1% simply Christians, 1.0% Protestants, and 0.3% Latin Rite Catholics), 0.5% were Muslims, 0.3% were Jewish, and 0.3% were Hindus. Not religious and other believers not identifying with any of the listed major religious institutions constituted about 24.7% of the population. It also showed that approximately 55.6% of the population of eastern Ukraine (which in Razumkov's mapping excluded Donbass and consisted of the regions immediately to the west of it) declared to be believers, while 13.4% declared to be undecided or non-believers, and 3.5% declared to be atheist. 
A 2007 survey by the Razumkov Centre asked "Would you like to have your region separated from Ukraine and joined another state?" In eastern Ukraine, 77.9% of respondents disagreed, 10.4% agreed, and the rest were undecided. 
In a poll conducted by the Kyiv International Institute of Sociology in the first half of February 2014, 25.8% of those polled in East Ukraine believed "Ukraine and Russia must unite into a single state", nationwide this percentage was 12.5%.
Religion in Tajikistan
The next largest religious community is presumably Russian Orthodox, the historical faith of many Ukrainians as well as Russians. A cathedral in Dushanbe, St. Nicholas, serves the Orthodox community. By the end of the Soviet era, Tajikistan also was home to small numbers of people belonging to other Christian denominations, including Roman Catholics (originally most of them were from German origins, but also Tajiks), Seventh-Day Adventists, and Baptists. There also was a small Armenian minority, most of whose members belonged historically to the Armenian Apostolic (Gregorian) Church. Other religious groups included Zoroastrians and small numbers of Jews and Baha'is. The number of adherents to these minority religions probably decreased sharply in the 1990s because of the wave of emigration from Tajikistan in the early independence period.