What international treaties and rules did Russia violate in 2022 when it started the illegitimate war against Ukraine? Supplement these descriptions with options that the West has to help Ukraine without directly intervening in the war, and why it could have strategic importance for whole Europe to help Ukraine.
Russia violated several international treaties and rules during its invasion of Ukraine in 2022. These violations included:

1. The United Nations Charter, which prohibits the use of force or violence in international affairs;
2. The Geneva Conventions, which protect the rights of soldiers and civilian personnel in conflict zones;
3. The Budapest Memorandum, which committed Ukraine and Russia to respect each other's sovereignty and territorial integrity;
4. The NATO Treaty, which provides mutual defense between member countries;
5. The European Convention on Human Rights, which protects human rights and dignity throughout the EU;
6. The Council of Europe's Framework Decision on the Use of Force Against Terrorism, which bars the use of military force except as a last resort in response to an imminent threat to life or physical safety;
7. The Russian Constitution, which requires respect for national borders and the right of every citizen to choose their own government.

The Western powers had several options to respond to Russia's actions without directly intervening in the war. They could have imposed sanctions on Russia, restricted its access to financial institutions, and encouraged allies to do the same. They could also have provided economic assistance and humanitarian aid to Ukraine, while continuing to pressure Moscow through diplomatic channels. Finally, they could have used military force to defend Ukrainian territory if Russia continued to attack.

Overall, helping Ukraine is important not only for Ukraine itself but also for the entire continent of Europe. By standing up to Russia's aggression, the West can demonstrate its commitment to promoting peace and stability in the region. This would send a strong message to other nations who may be considering similar moves, and could serve as a model for how to deal with future challenges in Eastern Europe.