Global tensions escalate across multiple fronts: US-Iran conflict intensifies with $37.5bn cost, Ukraine undergoes military leadership shake-up, Trump administration escalates Canada tariffs and Cuba sanctions, while health crises and regional conflicts spread from Middle East to Africa to South Asia.

US Defense Secretary Hegseth testified to Senate that the Iran war has cost $37.5 billion so far, with Pentagon requesting billions more in additional wartime funding as nearly 100 US troops have been injured in the last two weeks and at least three service members killed since hostilities resumed.

Ukraine's President Zelensky dismissed top military commander General Oleksandr Syrsky days after firing Defense Minister Mykhailo Fedorov, marking a major military leadership shake-up amid ongoing conflict with Russia and escalating drone attacks on Russian infrastructure including e-commerce warehouses.

Trump administration imposed 50% tariffs on Canadian goods effective in 30 days unless Canada drops what Washington calls 'discriminatory' trade barriers, intensifying trade tensions with the nation's top trading partner amid bipartisan concerns about economic impact.

Spanish hotel chain Meliá ceased operations in Cuba with all 34 sites closing by week's end due to Trump administration sanctions, while State Department issued a 100-page report accusing Cuba of posing a 'unique threat' as part of broader campaign to pressure the government.

Houthi militia in Yemen declared Red Sea blockade on Saudi Arabia, potentially opening a new front in the broader US-Iran conflict as the Iran-backed group edges closer to direct involvement in Middle East tensions.

Israel-Lebanon ceasefire negotiations advanced with Trump meeting Lebanese leader and pledging support for peace efforts, though Israeli forces remain in southern Lebanon fighting Hezbollah as regional instability persists.

Health crisis concerns mount with a UK humanitarian worker evacuated from Democratic Republic of Congo being monitored for Ebola at a London hospital, while seven American aid workers quarantined at Kenya facility after Ebola exposure amid regional outbreak.

South Africa experiences escalating anti-immigrant violence and protests as activists take extreme measures to expel foreign nationals, contradicting data showing myths fueling anti-immigrant sentiment do not align with factual economic impacts.

India faces youth education protests with thousands returning to demonstration sites in New Delhi after police forcibly dispersed gatherings, while opposition leader Rahul Gandhi arrested outside PM Modi's residence during mass protest over government failings.

Global food insecurity persists despite third consecutive year of declining hunger, with UN report showing 2.69 billion people cannot afford healthy diets due to high costs of fruits, vegetables and dairy, highlighting ongoing nutritional inequality.