LONDON/SINGAPORE, June 14 (Reuters) - The yen fell to an

over one-month low on Friday after the Bank of Japan (BOJ) stood

pat on interest rates and said it would trim bond buying, while

the euro, mired in a political turmoil, was headed for its

biggest weekly fall in two months.

The BOJ said at the conclusion of its two-day policy meeting

it would continue to buy government bonds at the existing pace

for now, and lay out details of its tapering plan at its July

policy meeting.

The dollar gained as much as 0.8% to 158.255 on the yen

, putting the yen at its weakest in more than a month.

The dollar was last up 0.4% at 157.61 against the yen.

"The yen is weaker today understandably given the BOJ has

once again failed to meet market (and our) expectations that had

moved to expecting the commencement of a slower pace of

purchases of (government bonds)," currency analysts at MUFG said

in a note.

"It is more significant from a signalling perspective and

again underlines BoJ caution that raises expectations of a

'go-slow' reversal of the BOJ's ultra-easy stance," they added.

BOJ governor Kazuo Ueda said at a briefing after the meeting

that the central bank was "paying close attention" to the impact

of the weak yen on inflation, adding that a rate hike in July

was a possibility depending on economic data.

Japan's chief cabinet secretary Yoshimasa Hayashi separately

said the government was closely monitoring the currency market.

In the broader market, the dollar was on the front foot,

helped by gains against the euro and safe-haven bids as France's

snap election call stoked fears of political uncertainty in the

country and the wider euro zone bloc.

The dollar index, which tracks the greenback against

six major peers, gained 0.3% to 105.51, its highest in a month.

U.S. employment data on Thursday added to bets the Federal

Reserve could kick off its easing cycle in September, but

analysts said the euro's weakness was the main factor driving

currency markets this week.

The euro was headed for a 1% weekly decline versus the

dollar, its biggest weekly fall in two months. It was last down

0.4% at $1.069450 on Friday.

The single currency has weakened across the board this week.

It fell to its lowest on the Swiss franc in three months on the

day, down 0.4% at 0.956.

"Macron's party suffered a substantial setback in the

European elections, and unfavourable results in the upcoming

elections could exacerbate concerns regarding the sustainability

of the country's debt," said Erik-Jan van Harn, senior macro

strategist at Rabobank.

Sterling fell 0.3% to $1.27245 versus the dollar.