Separatists in eastern Ukraine on Tuesday proclaimed a new state that aspires to include not only the areas they control but also the rest of the country.
President Donald Trump is breaking with tradition by visiting Poland, an ex-communist country in central Europe, before making a presidential visit to longtime allies Britain, France or Germany.
Moscow has only once before suspended the hotline, which was established in October 2015 to prevent conflict between the different forces operating in Syrian airspace.
Hundreds were arrested, including opposition leader and protest organizer Alexei Navalny, who was seized outside his Moscow residence while heading to the rally in the city center.
Only those with biometric passports — containing a microchip with personal data, including fingerprints — can take advantage of the visa-free travel for the time being.
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