The weakening yen, however, lifted Japan's Nikkei stock index almost 2% and nudged the dollar up more broadly - with the dollar index on course to end its best month in more than two years.
In another relief for inflation worriers, crude oil prices also fell sharply on Monday, dropping more than 4% after Israel's retaliatory strike on Iran over the weekend bypassed Tehran's oil and nuclear facilities and did not disrupt energy supplies - cooling tensions in the Middle East.
Many of the comments from both sides following the strike appeared to step back somewhat from further escalation with new moves for a truce in Gaza back on the table.
U.S. crude prices skidded below $68 per barrel for the first time in almost a month - and continued to track year-on-year losses of almost 20%.
Still, with some $139 billion of two and five-year Treasury coupons up for auction later on Monday and next week's U.S. election looming, Treasury yields climbed first thing to their highest in almost three months.
After a flat Friday and with Monday's economic diary thin, U.S. stock futures were higher ahead of the bell - but traders were bracing for a week packed with market-moving events.
Five of the so-called Magnificent seven of U.S. megacap stocks report earnings during the week - starting with Alphabet's quarterlies on Tuesday, Microsoft and Meta on Wednesday and Amazon and Apple on Thursday.
Tesla's 22% surge on its earnings last week has whetted appetites for what may be coming down the pike.
Alongside the BOJ decision, the health of the U.S. labor market once again comes into view - with a stream of updates on employment culminating in the release of the national payrolls report on Friday.
