Ukraine bans Russian men aged between 16 and 60 from entering the country following the imposition of martial law. President Petro Poroshenko says the ban is to prevent the formation of "private armies" in Ukraine. Russia says it does not plan to retaliate.
Martial law in Ukraine ends a month after an attack on three Ukrainian Navy vessels near the Kerch Strait.
Ukraine's Infrastructure Minister Volodymyr Omelyan says the ports of Berdiansk and Mariupol are effectively under blockade as Russia refuses to let any Ukrainian vessels leave or enter the Sea of Azov. President Petro Poroshenko calls on NATO to send warships to patrol the Sea of Azov.
After Kremlin spokesman Dmitry Peskov said on Wednesday the meeting between U.S. President Donald Trump and Russian President Vladimir Putin during the summit is still on, while flying to Argentina, President Trump tweets that, after conferring with his top National Security advisers, he decided to cancel the meeting, adding that it was not a good time since Russia has not returned the ships and sailors to Ukraine. Less than an hour earlier, Trump said that he would "probably" meet Putin and that he believed it was "a good time to have the meeting."
The Verkhovna Rada approves the introduction of martial law in 10 oblasts of Ukraine for a period of 30 days.