NOVOHANNIVKA, Ukraine — Ukraine's new president declared Sunday a day of mourning and vowed to punish those responsible after pro-Russia separatists shot down a Ukrainian military transport plane, killing all 49 crew and troops aboard.
The downing of the plane drew condemnation and concern from the White House, European leaders and U.N. chief Ban Ki-moon.
Ukrainian President Petro Poroshenko spoke firmly to glum-faced security officials at a televised emergency meeting Saturday, scolding the head of the country's SBU security service for "omissions" in measures to protect military aircraft.
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Poroshenko called for "a detailed analysis of the reasons" for the lapse and hinted that personnel changes were imminent. His office said he vowed to punish "those responsible for the tragedy in Luhansk."
Russia denies supplying the separatists and says Russians fighting in Ukraine are volunteers.
Tensions between Ukraine and Russia escalated in February after pro-Russian President Viktor Yanukovych was driven from office by protesters who wanted closer ties with the European Union and an end to the country's endemic corruption. Russia then seized and annexed Ukraine's Black Sea peninsula of Crimea.
Also in Kiev, about a hundred protesters hurled eggs and paint Saturday at the Russian Embassy and overturned several parked cars with diplomatic plates. One held a sign saying "Russia is a killer."