The U.K. is to send 120 armored vehicles and new anti-ship missile systems to Ukraine, Downing Street announced Saturday, after Prime Minister Boris Johnson paid an in-person visit to Ukrainian President Volodymyr Zelenskyy.

Johnson and Austria’s Chancellor Karl Nehammer made separate visits to Zelenskyy on Saturday, the latest in a string of leaders to travel to the country during the ongoing Russian invasion.

A photograph tweeted by Ukraine’s Embassy to the U.K. showed Johnson seated opposite Zelenskyy at a table in a pink and green stuccoed room. The post was captioned with the word “Surprise” and a winking face emoji.

The Press Service of the National Security and Defence Council of Ukraine said on its official Twitter account that the two leaders had held talks in Kyiv, posting several photographs of the pair’s previously unannounced meeting.

Johnson posted on Twitter that his visit to Kyiv was “a show of our unwavering support for the people of Ukraine” and announced a new package of financial and military aid.

“Ukraine has defied the odds and pushed back Russian forces from the gates of Kyiv, achieving the greatest feat of arms of the 21st century,” the U.K. PM said in a statement.

He praised Zelenskyy’s “resolute leadership” and the “invincible heroism and courage of the Ukrainian people,” adding that the U.K. “stands unwaveringly with them in this ongoing fight … we are in it for the long run.”

Following the meeting, Downing Street said the U.K. government would provide armored vehicles and anti-ship missile systems, “in addition to the £100 million worth of high-grade military equipment” announced on Friday.

Zelenskyy and Nehammer’s meeting was separate to the one with Johnson and happened earlier on Saturday, according to Zelenskyy’s official Telegram channel.

While several other leaders have visited Ukraine in recent weeks, the trip by Nehammer is significant given his country’s neutral status, which is enshrined in its constitution.

Austria is not part of NATO and does not supply weapons to Ukraine. It has, however, provided Ukraine with humanitarian aid and helmets and protection vests for civilian use, according to a statement from the Austrian Chancellery.

Nehammer said Saturday that while his country is militarily neutral, “We understand we have to help where injustice and war crimes take place.”

According to his office, Nehammer was set to meet with Prime Minister Denys Shmyhal and Kyiv Mayor Vitali Klitschko, before returning to Austria on Saturday evening.

Nehammer was also due to visit the Kyiv suburb of Bucha, which endured five weeks of near-constant firefights; after Russian forces withdrew from the town, the bodies of at least 20 civilians were found lying in one street, some with their hands tied.

Nehammer said Bucha was “a place of war crimes.”

“We have to make those war crimes known to the UN, and international justice must begin investigating and fight these crimes,” he said during a news conference with Zelenskyy.

The twin visits by Johnson and Nehammer came a day after top European Union officials made a trip to Ukraine. European Commission President Ursula von der Leyen and Josep Borrell, the bloc’s top diplomat, visited Kyiv and Bucha on Friday, alongside Slovak Prime Minister Eduard Heger.

During the visit, von der Leyen ceremoniously handed Zelenskyy an EU questionnaire to complete — a symbolic, but important step towards Ukraine’s membership of the bloc. Tweeting about the move, von der Leyen said: “We will accelerate this process as much as we can, while ensuring that all conditions are respected.”

The prime ministers of the Czech Republic, Poland and Slovenia visited Kyiv last month, at a time when it was still regularly targeted by Russian strikes. Like Johnson’s visit on Saturday, that trip was kept secret until the three leaders were in the country, travelling on a train from eastern Ukraine.