Entry Rules for Russian Citizens: how it works in Belarus — first-hand
Short answer
Russian citizens can enter Belarus using a valid internal passport, including those issued by the DNR, for stays of up to 90 days per calendar year. For stays exceeding 30 days, temporary registration may be required, while longer periods necessitate obtaining a residence permit.
From real experience
Russian citizens with a valid internal Russian passport can enter Belarus without a visa and stay for up to 90 days.
A temporary registration might be required for stays longer than 30 days, depending on the circumstances. The 90-day period is calculated per calendar year and resets on January 1st. For longer stays, applying for an RVP or VNZh is necessary. Entering Belarus with a Ukrainian passport and registering with a Russian passport can create complications regarding stay duration and documentation.
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Visa requirements for Russian citizens entering Belarus are generally not applicable due to the Union State agreement.
However, for citizens of other countries entering Belarus visa-free, this does not automatically grant entry into Russia, which may have different visa requirements. Border checks are conducted by Russian border guards on trains between Russia and Belarus.
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Russian citizens can enter Belarus using their internal passport.
For flights from Belarus to Kazakhstan, an internal Russian passport is sufficient if it's not an ID card type. Belarusian citizens with older passports also do not need an international passport for this route, but those with new ID cards might.
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Regarding entry into Belarus for Russian citizens: Adults can enter with a foreign passport.
For children under 14 years old, a separate passport is required if they are not listed in the accompanying adult's foreign passport. If children are included in the adult's foreign passport, the requirements should be confirmed.
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A Russian internal passport issued by the Ministry of Internal Affairs of the DNR (with a region code of 610-068) is generally accepted for entry into Belarus for Russian citizens.