KYIV, APril 27 (Reuters) - Europe should stop depending on Russia for trade after Moscow halted gas supplies to Bulgaria and Poland for not paying in roubles, Ukraine said, as the shutoff exposed the continent's weaknesses and divisions on Wednesday (Apr 27).

The decision, denounced by European leaders as "blackmail", comes as Russia's own economy wilts under sanctions and Western countries are sending more arms to Kyiv despite warnings from the Kremlin to back off.

Gazprom, Russia's gas export monopoly, suspended gas supplies "due to absence of payments in roubles", as stipulated in a decree from Russian President Vladimir Putin that aims to soften the impact of sanctions.

"The sooner everyone in Europe recognises that they cannot depend on Russia for trade, the sooner it will be possible to guarantee stability in European markets," Ukrainian President Volodymyr Zelenskyy said late on Wednesday.

While the president of the European Commission said Gazprom's move was "yet another attempt by Russia to use gas as an instrument of blackmail", EU member state ambassadors asked the executive for clearer guidance on whether sending euros breached sanctions.

France will host a meeting of EU energy ministers on May 2 to discuss how to deal with Russia's move.

Kremlin spokesperson Dmitry Peskov said Russia remained a reliable energy supplier and denied it was engaging in blackmail.

He declined to say how many countries had agreed to switch to paying for gas in roubles but other European customers said gas supplies were flowing normally.

On the battlefield, Ukraine reported that Russian troops had made gains in the east.

Russia reported a number of blasts on its side of the border, and a blaze at an arms depot. Kyiv called the explosions "karma".

Ukraine said Russian forces had used tear gas and stun grenades to disperse a pro-Ukraine rally in Kherson, the first big city it has seized. A series of powerful explosions caused by rockets hit the centre of Kherson late on Wednesday, Ria News agency reported.

The invasion of Ukraine has reduced towns and cities to rubble, and forced more than 5 million people to flee abroad in a conflict that has prompted fears of wider conflict in the West, unthought of for decades.