BELGRADE, Serbia — European Union candidate Serbia will continue to refuse to impose sanctions against Russia over its invasion of Ukraine despite Western pressure, Serbia’s leader said after his telephone conversation with Russian President Vladimir Putin on Sunday.

Populist Serbian President Aleksandar Vucic said on Instagram that he believes the call, what he said was his first in more than two years with the Russian president, will help “further development of relations and trust between Russia and Serbia.”

“We talked as people who have known each other for a long time, as friends, and the ten-minute conversation was marked by a personal note, and we also talked about those who are weak (pro-Western) leaders,” Vucic said.

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He did not say whether he would accept an earlier invitation by Putin to attend a BRICS summit of emerging economies, led by Russia and China, in Kazan later this week.

Although formally seeking EU membership, traditional Russian Slavic ally Serbia has refused to join Western sanctions against Russia over the war in Ukraine though it has reluctantly condemned Moscow’s aggression. Vucic has said that imposing the sanctions wasn’t in Serbia’s national interest.

He said Sunday he expects criticism from the West of his conversation with Putin, but stated that “Serbia is a sovereign country which makes its own decisions.”

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PHOTOS: Serbia's president talks with Putin and vows he'll never impose sanctions on Russia

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He also thanked Russia “for providing sufficient quantities of gas for Serbia at favorable prices.” Serbia was almost completely dependent on Russian gas but has recently agreed to start to diversify its supplies.

Serbia, which was never part of the Soviet bloc, on Sunday marked the 80th anniversary of the liberation of its capital Belgrade from the Nazi World War II occupation, which was accomplished mostly thanks to former Yugoslavia’s communist partisans, but also the Soviet Red Army.

Belgrade’s nationalist authorities marked the liberation date with a display of pro-Russian sentiment, with thousands marching through Belgrade waving Russian flags and chanting slogans.

At a meeting marking the anniversary, Vucic delivered a speech in the Russian language, which he said is a sign of respect for the Red Army, without which “there would not have been the liberation of Belgrade.”