The week in Ukraine's war with Russia: Key events explained in 5 graphics

Ukrainian forces continued to battle Russian troops as President Joe Biden's $40 million request for military-and-economic aid to Ukraine stalled in the Senate, despite swift passage in the House of Representatives.

The unexpected package delay is likely to push the bill's debate and vote into this week, during the same time Finland's Parliament is set to vote on joining NATO. Meanwhile, Russian-appointed officials have announced plans to annex the Ukrainian Black Sea Port city of Kherson.    

Here's what to know going into the week: 

Sen. Rand Paul stalls Biden's $40 million Ukraine aid package

After a quick approval by the House, with widespread bipartisan support, Biden's additional request of $40 million in military and economic aid to Ukraine as it continues to fend off Russian forces was halted in the Senate by Republican Sen. Rand Paul of Kentucky.