This past week has seen the most significant escalation in hostilities Ukraine has witnessed since Russia’s full-scale invasion and marks a new chapter in the nearly three-year war.

MOSCOW, Nov 21 (Reuters) - President Vladimir Putin said on Thursday that the Ukraine war was escalating towards a global conflict after the United States and Britain allowed Ukraine to hit Russia with their weapons, and warned the West that Moscow could strike back.

The Russia-Ukraine war, expected by both sides to last only days or weeks, has now reached its 1,000th day.

Putin is the primary decision-maker on the use of Russia's nuclear arsenal. The doctrine said any attack by a non-nuclear power supported by a nuclear power would be considered a joint attack, and that any attack by one member of a military bloc would be considered an attack by the entire alliance, it said.

In the week that saw the conflict pass its 1000th day, Western powers substantially boosted Ukraine's military arsenal - and the Kremlin made its loudest threats yet of a nuclear strike. Here is how the last week played out - and what it means.

President Joe Biden has reversed some of his own policy positions on Ukraine even as Russia has used new tactics in the conflict and warned of escalation. Ukraine says Russia launched an intercontinental ballistic missile,

The United States has agreed to allow Ukraine to use American weapons for attacks on Russia. Over 40% of Poles support this decision, according to a survey by SW Research for "Rzeczpospolita". The administration of U.

Putin vows to launch more missiles as Poland warns threat of global war is real - Russian president says Moscow has stockpile of such systems ready to use