Russia's Investigative Committee has accused the Ukrainians of illegal border crossing.
All 24 Ukrainian sailors, nabbed at a strait near Crimea last week, were moved to a Moscow pretrial detention centre on Friday.
The servicemen, including two security service agents, were arrested on Sunday, when three Ukrainian naval vessels in the Black Sea tried to enter the Kerch Strait to reach the Sea of Azov.
Russia's Investigative Committee has accused the Ukrainians of illegal border crossing.
In a tit-for-tat, Ukrainian President Petro Poroshenko has forbidden Russian male citizens from ages 16-60 to enter the country.
Russia and Ukraine have been at loggerheads since 2014, when Russia annexed Crimea after a controversial referendum.
Turkey, as well as the UN General Assembly, viewed the annexation as illegal.
Ukraine has also blamed Kremlin for separatist violence in eastern Ukraine, near the border with Russia.
Ukraine has received 500 million euros ($568 million) in assistance from the European Commission, President Petro Poroshenko said in a statement on Facebook.The EU, United States and the International Monetary Fund have supported Ukraine's economy since the annexation of Crimea in 2014.Poroshenko said the disbursal of 500 million euros was a "very important signal of the unwavering assistance of the European Union against the recent challenges from the Russian aggressor."Russia has no plans to ban entry to Ukrainian menUkraine bars entry to Russian men of combat age citing invasion fearsTrump cancels G20 Putin meeting over Ukraine
Ukraine receives 500 million euros in EU assistance
Russia believes U.S. President Donald Trump cancelled his meeting with Vladimir Putin due to domestic issues rather than the Ukraine situation, its foreign ministry said on Friday."Is the provocation started by Kiev in this area (Azov Sea) a real reason for the cancellation? We heard that as an official version and we accepted that. Is it a real one? I believe we should look for answers in the U.S. domestic political situation," spokeswoman Maria Zakharova was quoted as saying by Russian news agencies. Trump cancels G20 Putin meeting over Ukraine
Russia thinks Trump cancelled Putin meeting for domestic reasons
Russia does not plan to ban Ukrainian men from entering the country in a tit-for-tat response to a broad entry ban imposed by Ukraine, RIA news agency cited Russian lawmaker Frants Klintsevich as saying on Friday.Kiev said earlier on Friday that it had banned Russian adult men aged 16 to 60 from entering Ukraine, days after it imposed martial law, citing fears of a full-scale Russian invasion.Ukraine bans entry to Russian adult men: border service chief
Russia has no plans to ban entry to Ukrainian men
Ukraine on Friday banned Russian men of combat age from entering the country, a move introduced under martial law after Russia fired on and captured three Ukrainian naval ships off Crimea last weekend.Ukraine announced it was barring entry to Russian men between 16-60 years and a senior state security official said Kiev was considering whether to respond in kind with "mirror actions" to the Black Sea incident.Earlier, in a move applauded in Kiev, U.S. President Donald Trump called off a meeting with Russia's Vladimir Putin in Argentina to signal Washington's disapproval of Russian behaviour in the naval clash with Ukraine.News of the cancelled meeting pushed down the Russian rouble, which is sensitive to events that might lead to new sanctions being imposed on Russia.Trump cancels G20 Putin meeting over UkraineAnnouncing the move, President Petro Poroshenko, referring back to Russia's seizure and subsequent annexation of Crimea in 2014 and its support for separatist uprisings in eastern Ukraine, said it was important to stop full-scale invasion."These are measures to block the Russian Federation to form detachments of private armies here, which in fact are representatives of the Armed Forces of the Russian Federation," Poroshenko said."And not allow them to carry out the operations that they tried to conduct in 2014," he added.Ukraine's border service chief said there would be exceptions on humanitarian grounds, such as if Russians needed to attend the funeral of a relative.Russia thinks Trump cancelled Putin meeting for domestic reasonsOfficials said they might also impose additional restrictions on Russian citizens already in Ukraine.In Moscow, a Russian lawmaker was quoted by RIA news agency as saying Russia had no plans for a reciprocal move to bar Ukrainian men.Ukraine and Russia have blamed each other for last Sunday's clash at the Kerch Strait through which ships have to pass to reach Ukrainian ports at Berdyansk and Mariupol.It prompted Ukraine to introduce martial law for a period of 30 days from Wednesday in regions of the country thought most vulnerable to a Russian attack. Poroshenko has requested NATO to deploy ships to the area.Russia has no plans to ban entry to Ukrainian menRussian officials accuse Poroshenko of trying to manufacture a crisis to prop up sagging ratings ahead of an election next March.But the incident has prompted renewed calls for more Western sanctions on Russia.British Prime Minister Theresa May on Thursday said London would push for "appropriate sanctions" and called on Russia to release the Ukrainian vessels and crew.The United States and the EU have imposed sanctions on Russia since 2014, when Moscow annexed Crimea after a pro-Russian leader was toppled in Kiev.Fighting between Ukraine and Moscow-backed separatists has killed more than 10,000 people. Major fighting ended with a 2015 ceasefire but deadly exchanges of fire are still frequent. 
Ukraine bars entry to Russian men of combat age citing invasion fears
U.S. President Donald Trump abruptly canceled a planned meeting with his Russian counterpart Friday on the margins of the upcoming G20 summit in Argentina, citing ongoing tensions between Russia and Ukraine."Based on the fact that the ships and sailors have not been returned to Ukraine from Russia, I have decided it would be best for all parties concerned to cancel my previously scheduled meeting in Argentina with President Vladimir Putin," Trump said on Twitter.Still, Trump held out hope for a future bilateral meeting with Vladimir Putin, saying he looks "forward to a meaningful Summit again as soon as this situation is resolved!"NATO to assess presence in Black Sea amid Azov crisisThe announcement came hours after he told reporters at the White House he would "probably be meeting with President Putin" at the G20, shortly before departing for Buenos Aires, Argentina, where the two-day summit will take place beginning Friday"We haven’t terminated that meeting. I was thinking about it, but they’d like to have it. I think it's a very good time to have the meeting," he said before making the surprise declaration while aboard Air Force One.On Sunday, Russia seized two Ukrainian navy ships and a navy tugboat along with two dozen crew members off the Crimean Peninsula, accusing Kiev of entering its waters and provoking a conflict.Ukrainian leader says Putin wants his whole country, asks for NATO helpUkraine accuses Russian warships of opening fire on the ships without cause, asserting that crew members were wounded and vessels were seized by Russia unlawfully.Russia and Ukraine have been at loggerheads since 2014 when Russia annexed Crimea after a controversial referendum.The international community continues to view the annexation as illegal, and the election Russia uses to justify its seizure as illegitimate.Russia deploys new S-400 missile systems in Crimea
Trump cancels G20 Putin meeting over Ukraine