A Ukrainian diplomat said the consuls pay visits to detained Ukrainians across Russia.
A flashmob was staged at the Ukrainian Embassy in Moscow on the occasion of the birthday of Ukrainian journalist Roman Sushchenko, who had been illegally held in the Lefortovo detention center after being charged with "espionage".
Ukrainian diplomats flew a banner saying "Happy Birthday, Roman!" and a hashtag #FreeSushchenko to express their support, according to an UNIAN correspondent in Russia.
Charge d'Affaires of Ukraine in the Russian Federation Ruslan Nimchynskiy said that the consul had arrived in the detention facility to meet with Roman Sushchenko and send everyone's greetings.
"We wish him strength of mind and good health. We have hope and we are doing everything so that Roman meets his next birthday with his friends and family," Nimchynskiy said.
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"Sometimes our consuls drive a thousand kilometers to provide assistance, both moral and financial," he said.
"Ukraine will do everything possible so that journalist Roman Sushchenko would soon return home just as other Ukrainians who are being held hostage in Russia, occupied Crimea, and Donbas," Ukrainian President Petro Poroshenko wrote on Facebook.
Read alsoMoscow court extends Sushchenko's arrest until March 30
September 25, 2017, Moscow's Lefortovo district court extended the arrest of the Ukrainian journalist until November 30.
On October 21, Feygin said that the investigation into the Sushchenko case had been completed.
On November 10, the Moscow court found it legitimate to extend the arrest of Sushchenko until November 30.
On November 27, the Moscow City Court extended the arrest of Sushchenko for another two months, until January 13, 2018.
On January 24, 2018, the Moscow City Court extended the arrest of Sushchenko until March 30, 2018.