Ukrainian President Volodymr Zelensky has vowed that those responsible for this morning's Russian missile attacks on Ukrainian civilians will be held accountable.
According to Ukrainian officials, at least36 people were killed as a result of attacks on Ukrainian cities, which included a direct strike on a children's hospital in Kyiv.
"Everything that was destroyed by Russian terrorists will be rebuilt," said Mr Zelensky, adding that "all those who give orders to attack civilian sites will be punished".
The Ukrainian president was speaking in Warsaw, ahead of traveling to Washington DC where he will take part in meetings on the sidelines of a NATO summit from 9 to 11 July.
Standing alongside Polish Prime Minister Donald Tusk, both leaders began a press conference by observing a minute’s silence for the victims of this morning’s attacks.
Ukraine has called for a meeting of the United Nations' Security Council following the Russian missile attacks, Mr Zelensky said.
Mr Zelensky was visiting Warsaw to sign a bilateral security agreement with Poland, similar to agreements signed with more than a dozen other countries to date, including the United States, Japan and a number of EU countries.
Poland agreed to provide Ukraine with further military aid packages this year and "robust support" over the next decade, while both governments agreed to closer military and economic cooperation and to improve the capability of Ukraine's armed forces.
The agreement, Mr Zelensky said, will help Ukraine to "protect the lives of our citizens and to counter the Russian threat", adding that he was grateful for Poland’s contribution of military equipment, weapons and ammunition.
Mr Zelensky said that Ukraine and Poland were in discussions to devise a mechanism that would allow Poland to shoot down Russian missiles and drones over Ukrainian airspace when fired in the direction of Poland.
He also announced that both leaders had reached agreement to form and train a new Ukrainian military legion in Poland, which would enable Ukrainian citizens living in Poland to join Ukraine’s armed forces.
During this afternoon’s press conference, Mr Tusk said that Poland would continue to press for Ukraine’s membership of the European Union and NATO.
"Poland is helping Ukraine not only out of friendship and solidarity, but also out of its own interests," said Mr Tusk, adding that "whoever defends Ukraine today, also defends itself".
The Polish Prime Minister also directed a message at Hungarian Prime Minister Viktor Orbán, who was visiting Beijing today for talks with China's Premier Xi Jinping.
Mr Tusk said that "history remembers politicians who said they were working for a just peace, but advocated capitulation", and urged Mr Orbán not to negotiate on behalf of Ukraine or Europe without getting their agreement first.
Reuters reported that Mr Orbán said China "had a key power in creating the conditions for peace in the Russia-Ukraine war".
Hungary took over the rotating presidency of the Council of the EU last week, and since then Mr Orbán has visited Kyiv for talks with Mr Zelensky, and Moscow where he met Russian President Vladimir Putin.
"The role of mediator between Russia and Ukraine can only be played by a grand alliance," said Mr Zelensky, appearing to dismiss any solo efforts by the Hungarian leader to mediate a ceasefire.
Mr Zelensky also met Polish President Andrzej Duda this afternoon before traveling on to Washington,
Mr Duda, who will represent Poland in Washington at the summit, urged Ukraine to be admitted to NATO, "if the Ukrainian public has the will to belong to the North Atlantic Alliance", reported the Polish Press Agency.
Yesterday, the UK’s new foreign secretary, David Lammy, visited Poland where he held talks with the country’s foreign minister Radosław Sikorski to discuss common security interests the threat posed by Russia's war in Ukraine.
