One of the technology industrys biggest annual get-togethers is set to kick off in the Spanish city of Barcelona on Monday, under the shadow of Russias invasion of Ukraine. The Mobile World Congress, where smartphone and telecoms companies show off their latest products and reveal their strategic visions, is expected to welcome more than 40,000 guests over its four-day run. Organizers hope to return to a full-scale event after two years of disruption caused by the coronavirus pandemic, AFP said. But Russias invasion of Ukraine has hampered preparations for this years edition, with organizers forced to remove the countrys dedicated pavilion. Industry body GSMA, which stages the annual event, said in a statement it was complying with all sanctions and policies regarding Russia. It confirmed, however, that Russian firms may still be able to participate. The invasion has sparked wider jitters, with the industry assessing sanctions slapped on Russia by the United States and Europe and a likely shortage of key raw materials caused by the conflict. - Pandemic woes - The MWC was cancelled at the last minute in 2020 as the pandemic spread from China to Europe, and last years edition was drastically scaled down. The pandemic continues to cast its shadow with big names like Sony, Asus and Lenovo pulling out or participating "virtually". But organizers are bullish, with GSMA director general Mats Granryd saying 95 percent of speakers will be in Barcelona. Among the tech giants confirming their attendance are smartphone behemoth Samsung, as well as Nokia, Ericsson, Google, Huawei and Verizon. Focuses of this years event include the rise of 5G, the opportunities offered by the Internet of Things (IoT), the metaverse and the impact of tech on the environment. Few new products are expected to be unveiled by the major players, many of whom have showcased their latest releases in the weeks leading up to the get-together. - No shelter - The show will, however, provide Chinese phone makers such as Oppo, Xiaomi and Vivo with a "coming out party", according to Ben Wood of CCS Insight. "Its the first time they will be able to flex their muscles at a big Western trade show," he told AFP, pointing out that they have all become much bigger during the pandemic. They are filling a void left by Huawei, which has been hobbled by sanctions imposed by the US in 2019 over accusations its wireless systems could allow spying by Chinese state entities. The entire industry will now need to reckon with sanctions over the Ukraine invasion, with the US already announcing restrictions on technology exports to Russia. "The smartphone market, and other technology product markets, are unlikely to remain sheltered from the impact of the crisis in Ukraine, given the economic and geographic significance of both Russia and Ukraine," said Marina Koytcheva of CCS. Both countries supply raw materials such as neon and palladium used to manufacture smartphone components. And the conflict could lead to shortages of many other products and rising prices, which could in turn hit demand for phones, she said. The smartphone market grew by 5.7 percent last year, with 1.35 billion devices sold worldwide, according to analyst firm IDC. Samsung sold the most phones followed by Apple and Oppo.