NATO jets scrambled to shoot down at least 10 Russian drones after they were spotted in Polish airspace.
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The US and Europe hope protections for Ukraine can end the conflict. But previous attempts have fallen flat.
The Trump administration has signaled that its support for NATO countries might not be absolute. This worries European observers, who have long looked to the US for military leadership.
NATO’s treaty has loopholes that give member countries, including the US, power over whether or not they want to intervene in a particular conflict.
Donald Trump has threatened to not defend some NATO countries if Russia attacks them. But the US also benefits from the power that NATO gives it, as well as the stability it helped create in Europe.
Leaders of the Western military alliance meet in Lithuania with the ongoing war in Ukraine as a backdrop.
Nato leaders meet in the Lithuanian capital Vilnius next week - it won’t be plain sailing.
The world held its breath when a Russian-made missile landed in Poland. What would it take for Nato to intervene militarily?
Polish authorities are investigating what they initially believed to be a Russian-made missile blast close to the border with Ukraine. Later, the country’s president said it was likely to have been an accident.
This explosion in Przewodow is unlikely to trigger a wider war. But it will have repercussions for Vladimir Putin and his flailing invasion of Ukraine.
Sandwiched between Russia and NATO ally Norway, both Sweden and Finland have maintained neutrality in global conflicts. That changed in February 2022, when Russia invaded Ukraine.
Article 5 of the Nato treaty calls for collective defence if a member nation is attacked.
Russia’s invasion of Ukraine poses a security threat to member states of Nato.
Turkey is a NATO member but that doesn’t mean its NATO allies will come to its support in Syria.
Top contributors
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Research Professor of Joint, Interagency, Intergovernmental, and Multinational Security Studies, US Army War College
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Professor of International Politics, University of Birmingham
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Lecturer in Strategic Studies and International Relations, University of Reading
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Assistant Professor, Department of Political Science and Public Management, University of Southern Denmark
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Associate Professor of Political Science, University at Albany, State University of New York
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Professor of Political Science, Emory University
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Professor Emeritus of Political Science and International Relations and Spatial Sciences, USC Dornsife College of Letters, Arts and Sciences
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Senior Lecturer in Defence Studies Education, King's College London
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Senior Researcher, Center for Security Studies, ETH Zurich, ETH Zurich
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Professor of History and International Affairs, University of North Carolina at Chapel Hill
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Professor of Government, Wesleyan University
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Associate Professor (Adj), Griffith Asia Institute; and Fellow, Strategic and Defence Studies Centre, Australian National University
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Professor of Law, American University
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Professor of History and Political Science, University of Michigan