German Chancellor Olaf Scholz is flying to Ukraine and Russia this week in an effort to help defuse escalating tensions as Western intelligence officials warn that the possibility of a Russian invasion of Ukraine is increasing. Ahead of his first visits as chancellor to Keiv on Monday and Moscow on Tuesday for meetings with the Ukrainian and Russian presidents, Scholz has renewed his warning to Russia and his advocacy of continuing diplomacy in multiple formats. "It is our job to ensure that we prevent a war in Europe, in that we send a clear message to Russia that any military aggression would have consequences that would be very high [...] and that we are united with our allies," Scholz told the German parliament's upper house on Friday. "But at the same time that also includes using all opportunities for talks and further development," Scholz said. Adding to tensions, Russia launched new naval maneuvers in the Black Sea on Saturday to practice "defending" Crimea, the peninsula it annexed from Ukraine in 2014. The Defense Ministry also claimed that the Russian navy had driven a US submarine from its waters in the Pacific Ocean on Saturday. The Pentagon said "there is no truth" to Moscow's claims about US operations in Russian territorial waters. Russia has concentrated more than 100,000 troops near Ukraine's border and launched a series of military maneuvers in the region but says it has no plans to invade the nation. Moscow wants guarantees from the West that NATO will not allow Ukraine and other former Soviet countries to join as members and for the alliance to halt weapon deployments to Ukraine and roll back its forces from Eastern Europe. The US and NATO flatly reject these demands. Scholz has repeatedly said that Moscow would pay a "high price" in the event of an attack. Still, his government's refusal to supply lethal weapons to Ukraine or spell out which sanctions it would support against Russia have drawn criticism abroad and at home and raised questions about Berlin's resolve to stand up to Russia. Asked on Friday whether Scholz will be taking any new initiative to Keiv and Moscow or the positions that are already on the table, his spokesman, Steffen Hebestreit, replied that he would stick with "the positions that we have already set out". Germany's reluctant position is partly rooted in its history of aggression during the 20th century when the country's militarization in Europe during two world wars led many postwar German leaders to view any military response as a very last resort. Experts say despite this historical burden, it is of utmost importance now that Scholz stresses Germany is in sync with its European and American allies, especially when he meets with Russian President Vladimir Putin. "Scholz has to convey a very clear message in Moscow, and it can really only be: There is unity and oneness in the Western alliance. There is no possibility of driving a wedge into the Western alliance, and that must be understood in Moscow. I think that's the most important message he has to convey there," said Markus Ziener, an expert with the German Marshall Fund. "At the same time, he has to make it clear that the costs are high," Ziener added. "That's basically the message that is most likely to catch on in Moscow as well. So a military invasion of Ukraine has significant consequences for Russia." Scholz has not explicitly said what consequences or sanctions Russia would face if it invades Ukraine. Still, it is clear that the future of the controversial Nord Stream 2 pipeline that seeks to bring Russian natural gas to Germany under the Baltic Sea, bypassing Ukraine, is at stake. US President Joe Biden threatened last week that the pipeline would be blocked in the case of an invasion. That would hurt Russia economically but also cause supply problems for Germany. The pipeline has been completed, but it is not yet operating. "Germany doesn't have much leverage, except for saying that it won't approve Nord Stream 2, which is the only political leverage," Claudia Kemfert, the head of the department of energy, transport and environment at the German Institute for Economic Research, said. "Otherwise, Germany is very susceptible to blackmail. We can't do too much. We have committed ourselves to getting the gas supplies, unlike other European countries we have not diversified our gas supplies and we have dragged our feet on the energy transition. So we did a lot of things wrong, and now we are paying the price," Kemfert added. Ukrainian President Volodymyr Zelenskyy spoke of the need for calm as he observed military exercises Saturday near Crimea, the peninsula that Russia seized from Ukraine in 2014. "We are not afraid, we're without panic, all is under control," he said. The US and numerous Western governments have urged their citizens to leave Ukraine, and Washington on Saturday said it was ordering most of its embassy staff in Kyiv to leave. Canada has also shuttered its embassy in the country. But Zelenskyy pushed back against what he labeled as excessive amounts of information about impending war. "The best friend of our enemies is panic in our country. And all this information is just provoking panic and can't help us," he said. "I can't agree or disagree with what hasn't happened yet. So far, there is no full-scale war in Ukraine." "We have to be ready each day. It did not begin yesterday. It began in 2014, so we are ready and this is why we are here," Zelenskyy said, referring to Russia's annexation of Crimea and backing for an anti-Kyiv separatist insurgency in the east. In a separate statement, the head of the Ukrainian armed forces Lt.-Gen. Valery Zaluzhny and Defense Minister Oleksii Reznikov said any invader would not take Keiv, Odessa, Kharkiv or any other city in Ukraine. "We have strengthened the defense of Keiv. We have gone through the war and due preparation." "We are ready to meet the enemy, and not with flowers, but with Stingers, Javelins and NLAWs" — anti-tank and -aircraft weapons, they said. "Welcome to hell!" In Keiv, thousands of demonstrators marched on Saturday, saying they refused to give in to panic, even if they took the threat seriously. "Panic is useless. We must unite and fight for our independence," said student Maria Shcherbenko, holding a sign reading "I remain calm. I love Ukraine". Hungary's nationalist prime minister warned Saturday that a Russian invasion of Ukraine could send hundreds of thousands of Ukrainian refugees fleeing across the border into his country. Right-wing populist leader Viktor Orban, speaking in an annual address that this year kicked off his political campaign for Hungary's parliamentary election on April 3, urged a peaceful resolution to the rising tensions in Europe that have stemmed from fears of an imminent Russian invasion of Ukraine. Orban — a firm opponent of any immigration — said it was in Hungary's best interest to "avoid war," which he said would cause a wave of Ukrainian refugees and a disruption of the economy. While urging a resolution of the tensions through dialogue, Orban said he opposed plans by the European Union to use sanctions against Russia — which has built up over 100,000 troops along Ukraine's borders — as a deterrent. "Sanctions, punitive policies, lecturing or any other kind of arrogance on the part of the great powers are out of the question," Orban said. Orban, who has led Hungary since 2010, has sought one of the closest relations with Russian President Vladimir Putin of any European leader. In a meeting with Putin in the Kremlin last week, Orban lobbied for increased gas shipments from Russia and lauded his country's increased cooperation with Moscow in the areas of energy, trade and security. Since Russia annexed Ukraine's Crimean Peninsula in 2014, Hungary under Orban has consistently opposed leveling EU sanctions against Moscow, although it has always ultimately voted for them. Hungary has also blocked ministerial meetings between Ukraine and NATO over a Ukrainian language law that Budapest argues violates the rights of the Hungarian ethnic minority in western Ukraine. Yet on Saturday, Orban said that Ukraine serves as a crucial buffer zone between Hungary and Russia and that its "independence and viability are therefore of direct Hungarian interest." Declaring that "the military strength of Europe should at least be comparable to that of Russia," Orban said that Hungary supports the development of European military capabilities and a joint European defense force. Hungary has declined to accept military reinforcements from NATO and the United States — which have been mobilized in several other Eastern European countries in response to the buildup of Russian troops along Ukraine's borders. He says Hungary's domestic military is sufficient to protect the country. — Euronews