Leaders of the European countries will be traveling to Ukraine’s capital Kyiv on Tuesday as Russia’s bombardment of the country continues. Leaders of Poland, the Czech Republic and Slovenia will be in Ukraine for a European Union mission to show support.

Russian and Ukrainian negotiators also planned to hold a second day of talks as Russia’s invasion of Ukraine entered its 21st day.

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Petr Fiala, the Prime Minister of the Czech Republic, said that “the aim of the visit is to express the European Union’s unequivocal support for Ukraine and its freedom and independence.”

Polish Prime Minister Mateusz Morawiecki and Slovenian Prime Minister Janez Janša would also be joining European Union‘s diplomatic mission to Ukraine. Poland’s deputy prime minister for security Jaroslaw Kaczynski will also be present.

The purpose of the visit was to confirm “the unequivocal support of the entire European Union for the sovereignty and independence of Ukraine” and to “present a broad package of support for Ukraine”, a statement issued by the Polish government read.

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According to reports from Politico, the European Union is set to release its fourth list of sanctions, which will include multiple companies and individuals. Several defence companies are also expected to be on the list.

Meanwhile, Ukraine’s diplomatic efforts have also continued. Volodymyr Zelensky, the Ukrainian President, will be addressing the United States Congress on Wednesday at 9 am ET, according to a letter addressed to House and Senate members by Speaker Nancy Pelosi and Majority Leader Chuck Schumer.

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Talks between Russian and Ukrainian negotiators were due to resume Tuesday, after failing to make a breakthrough on Monday, according to reports from Associated Press.

The two sides had expressed some optimism about the negotiations, which Ukrainian presidential aide Mykhailo Podolyak said would discuss “peace, ceasefire, immediate withdrawal of troops & security guarantees.”